The Roman City in Motion Presentation Kiel, Germany

Image: North Cardo Maximus, facing south towards the forum, at Ostia (Jeff Veitch)

I am in Germany for an international workshop (details here) and presented some of my work on porticoes. Unlike the majority of presentations last year, I presented from a manuscript, as I wanted to stay focused on some key points of discussion. I had not originally planned to discuss porticoes (was going to save it for another paper), but did not have the time to develop my work on the Vicus Iugarius in Rome to a presentable point.  The majority of questions following the paper were aspects of clarification, many of which were due to my ownpresentation style. I continually struggle with a good balance between spatial theory, physics of sound, and my case studies. In this paper there is a clear preference on the theoretical framework, at the expense of the physics of sound and sound analysis. I have included a summary of the discussion following the paper at the end.

The Roman City in Motion: Senses, Space and Experience

Jeffrey D. Veitch, University of Kent

[Title Slide] Thanks to the organisers of the session and to you all for being here.

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Image: Lefebvre on Roman space

[Lefebvre Rome] At several points, Henri Lefebvre makes reference to two topics taken up in this paper: the senses and Roman space, although neither is in reference to the other. For Lefebvre, following Nietzsche and Marx, the senses are theoretical tools for understanding space,[1] while Rome serves as a concrete example of the social production of space within Lefebvre’s history of the city.[2] In this paper, I take Lefebvre’s twin suggestions as a starting point for a theoretically informed interpretation of Roman urbanism. That is to say, the senses serve as tools for understanding the reciprocal influence of the body and space in the formation of urban experience.

Using the senses as a theoretical tool, following Lefebvre, I want to make this argument: by placing the sensory experience of street acoustics under the microscope, I argue for an experiential agency of portico space that is shaped by physical architecture, bodily movements and literary perceptions. Each of these aspects will be addressed in that order and set the framework for the argument of this paper. In this way, I draw together the two elements of Lefebvre’s suggestions and argue for experiential agency as sensory perceptions of urban space and its formation of the Roman sensorium.

The Senses as Kinaesthetic Tools

[Lefebvre books] Let us begin by listening to Lefebvre and bringing his insights in line with recent emphasis on kinaesthetic and embodied forms of knowledge. Recent studies of Roman space and spatial concepts have drawn primarily from the work of Henri Lefebvre. Writing in the late 1960s to mid-1970s, Lefebvre formulated the groundwork for what was letter termed the ‘spatial turn’(See Harvey, Social Justice and the City (University of Georgia 1973); Soja, Postmodern Geographies (Verso 1989)). Lefebvre suggests a ‘pedagogy of the body’ that ‘would connect the conceived to the lived (and conversely), assumes a form of qualitative knowledge still in a state of germination and promise. Rhythmanalysis, for example’.[7] The invocation of rhythmanalysis draws the senses and times into this ‘pedagogy of the body’, as the rhythmanalist ‘thinks with his [sic] body’.[8] This further elaborates the nature of Lefebvre’s tripartite division of space between the conceived, perceived, and lived. The knowledge derived from the connection of the conceived and lived is sensory knowledge. Lefebvre draws on smells and musical metaphors to describe the rhythmanalist’s methods and emphasises the measurement of space by the body.[9]

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Image: Libet Diagram (Source on the slide)

Lefebvre does not develop these ideas into a method and they are scattered throughout his diverse writings. Here I want to draw in some more work, which grounds these ideas in movement and embodiment. [Libet Diagram] By the end of the 1970s, several experiments had verified that between an event and our sensory experience there was a half-second delay.[11] In following experiments it was further confirmed that unconscious reactions had delays of 100 ms, or a tenth-of-a-second delay.[12] What this suggested is that conscious reflection or action based on sensory stimuli was, in fact, a reflection on a past event, all be it a very recent past event.[13] To put this in Lefebvrean terms, lived space precedes conceived space in its mediation by the senses. Or simply, we sense the world before we act, think or reflect on that world.

This places human agency at the start of interactions with the built environment, rather than beginning with language or thought. I like the emphasis on agency; performative acts do ‘something’ to space (I am also keen to keep the ‘something’ ambiguous). Here reflexivity becomes important, especially in terms of atmosphere and the social action of participants. I want to extend the reflexivity to the space of action, as well as the action itself. The reflexivity of architecture coincides with the reflexivity of the senses.[15] In my own work, I stress the role of architecture in social construction based on auditory experience; the human bodies auditory system interprets space in the act of hearing. At the same time, what, where, and how we hear are part of the social and cultural understandings (habitus) we learn through repetitive experience of space.

Interpreting Streets through the Senses

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Image: AC & TL Diagram (Veitch 2017)

[AC & TL] The embodied knowledge carried within a cities inhabitant’s places agency as central to knowledge formation.[16] Simply put, human agents create the social, cultural and physical world through sensory experience, first unconsciously and then through cognitive reflection. However for Romans to be social agents a mass of infrastructural material must already be in place.[17] The infrastructural materials can be assessed and measured to analyse the kinaesthetic experience in terms of comparative figures. Physical dimensions and construction materials shape the auditory experience of the streets, which can be measured using modern acoustic design tools.

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Image: Eleanor Betts recent publication (Routledge 2017)

[EB Book] In my chapter in Eleanor Betts’ recent publication, I focus on Absorption Coefficient (AC) and Transmission Loss (TL). I explain the physics of these measurements in that chapter and here point out the basic difference as sound reflected, AC, or sound passing through the material, TL.[18] [Augustus] The reflection, resonance and other auditory effects of sound create the experience the body interprets in the half-second delay. These auditory effects are directly related to the dimensions, size and shape of urban space. In particular, I want to look at the basic architectural structure of streets in Ostia, with some comparisons to Pompeii and Rome, to assess the kinaesthetic experience and knowledge potentially created.

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Image: Streets and Shops in Ostia (Veitch 2017)

[Ostia] At the scale of the city, by the second century CE Ostia had developed beyond any formal grid system. However other forms of standardisation were at work within Ostia. Ellis has shown a clear preference in Ostia for shop entrances on the right-hand side of the threshold.[19] Street widths in Ostia display an uneven geographical distribution, same as Pompeii, although with a clear preference in width of 4-6 m.[20] However Ostia has a limited number of streets roughly 8 m in width, the other major grouping in Pompeii.[21] Instead, 94% of the streets in Ostia are less than 7 m in width. The widespread use of basalt on streets across Ostia suggests a certain foundational auditory experience, as the absorption coefficient is low (0.01-0.02) and sound would reflect off the surface.

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Image: Streets and Porticoes in Ostia (Veitch 2017)

In terms of auditory experience, the limited range of widths in Ostia suggests building height and architectural elements being prime motivators of auditory differences. Unlike Pompeii, street architecture, such as benches and sidewalks, are primarily reconstructed and there are limited remains for analysis. [Portico map] Porticoes appear in Ostia, although again, in an uneven geographical distribution across the city. Beginning in the early 2nd c. CE, several large-scale building projects, with associated porticoes, began to reshape the city’s urban experience.[22] Unlike benches, fountains, or shrines, porticoes create a space of experience defined by the architecture. The semi-enclosed area is experienced as acoustically separated space from the roadway beyond, even as sounds will pass between the two auditory fields. In this way, the two auditory fields influence each other. Sounds from one bleed into the other. What becomes an issue is the terminology and language of description, which we will return to at the end.

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Image: Sound Dissipation on 3 Streets in Ostia (Veitch 2017)

[Sound dissipation] Turning to the kinaesthetic experience of porticoes and streets in Ostia, the acoustic properties of street canyons can be modelled using based on the materials and dimensions of the street. Here the sound dissipation on 3 streets, all with porticoes along some part, is modelled. Measurement is made based on a noise in the centre of the street. The Decumanus is the widest (10 m), while the N Cardo is the only street with porticoes on both sides for the whole length (130 m). What the graph indicates is the steep dissipation of sound in the Decumanus, while N Cardo mimics this experience due to the addition of porticoes. In the case of the Via Epagathiana, with a portico on one side and for a limited length the dissipation is skewed on one side of the graph. However, the experience of sound in all three streets shows similar trends. Chronologically, the N Cardo is the earliest large-scale redevelopment with a portico as a defining feature in Ostia (116 CE). Porticoes are constructed along the neighbouring Via dei Misuratori del Grano and Via della Fortuna the next year (117-8 CE), while the forum is finished in the 120s.[23]

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Image: Chronology of Porticoes and large-scale building projects (based on DeLaine 2002)

[Portico chronology] It is worth briefly concluding on the chronology of porticoes and shop standardisation outside of Ostia. Pompeii does not have any porticoes along it’s streets in the 79 CE plan. Rome, on the other hand, sees two distinctive groupings of portico construction, namely the late Republican/Augustan period and the Flavian period.[24] However these porticoes were a distinct architectural form, one that does not continue after the Flavian’s in Rome.[25] In roughly the same time period, the regulation of street porticoes is prescribed following the 64 CE fire in Rome.[26] While the literary sources, from the 2nd c. CE (Tacitus and Suetonius), set the motivation for porticoes in the need to control and prevent fires, it is worth noting that it is in the same time period as the last series of portico structures. Here the distinction between experience, in the streets of the 2nd c. CE, and narrative reflection, instigated in the 1st c. CE, is evident. Returning to Ostia, it is not during the Flavian period that porticoes begin to appear but rather at the start of the 2nd c. CE. That is to say, the experience of the portico street was an experience in Rome that reappeared between Pompeii’s destruction and the start of Ostia’s large scale rebuilding.

That the auditory experience is important is obvious, however the connection of that importance to understandings of Roman space is subtler. At the start of this paper, I drew on Lefebvre’s suggestions to use the senses as theoretical tools and the role of Rome in the production of (social) space. Porticoes, I argue, serve to bring together these two points. I noted the unconscious experience of space as being the first point of interaction between humans and the built environment. In the case of the N Cardo, the two porticoes lining the street created a comparable auditory experience to the wider and more limited portico frontage along the east Decumanus. The Via Epagathiana showed the way portico frontage, in that case on the west side, altered the auditory experience of the street. Further study of other streets and porticoes will nuance these findings further.

Conclusions

[Concluding slide] Finally, I want to end with a brief comment on sensory and spatial metaphors as ways of describing the changes in perception. Out of the experience of space, and in particular the changing experience of streets at the end of the first, beginning of the second century CE, Romans perceived of space differently, although not in complete rejection of previous perception.

The associations and metaphors used to describe this translation of experience into literature give clues to the power these experiences could have. Today, we rely on visual and spatial metaphors to describe social relations and urban environments; cities are images, the public eye, we ‘map’ and ‘explore’ social relations and networks. However, these visual and spatial metaphors reduce spatial and social relationships to static and abstract understandings.[29] In the translation of experiences of space to literary reflection vision is given power over other sensory experience.

In the Latin literary context, the verb incedo and its noun incessus refer to walking, which also carries associations with bearing or how one carries oneself.[30] The association of movement with comportment is key. In moving through the city, inhabitants carried themselves, or, in Bourdieu’s terms, enacted their habitus. By drawing movement and comportment together the metaphor places the power on walking, not seeing. The person walking/carrying themselves is the subject. What are necessary are a need to critically evaluate the experience of space, as I have tried to show, as well as the metaphorical conceptions of space. Non-visual, sensory metaphors offer a way forward in understanding the metaphorical architecture of Roman urbanism.

Discussion:

1. If sounds could happen anywhere on the street or in the portico, why is the model based on a sound in the centre of the street? i.e. carts, sellers in the portico, people walking in the street or in the portico.

The model of the acoustics is based on generic sound (white noise, or sound across all frequencies) in a fixed location. This gives us the acoustic foundation from which we can then move to particular sounds. In this paper, I focused on the architecture along the street and the role of porticoes in altering street acoustics. I was less concerned with the catalogue of sounds possibly produced along the street.

2. As a medievalist, we have evidence for mud and dirt along streets and these would dampen sound. Is there any evidence of this in the Roman period?

Short answer: no. There are anecdotal stories of magistrates not cleaning streets (Suetonius, Vespasian 5), legal regulations of what can be left outside of properties (Dig. 43.11.1.1), duties for magistrates to clean and maintain streets and sewers (Dig. 43.23.1-2). Mud and dirt would dampen the sound dissipation of the streets.

[Later thought: this dampening would suggest that the sound dissipation curves for the N Cardo and Via Epagathiana would decrease at the top, moving closer to the Decumanus curve. In the case of the Decumanus, the dampening would happen at the edges of the curve, due to the streets extended length]

3. I am working on urban ecology, what would be the role of birds in your analysis or are there any studies on bird noise?

I do not know of any studies of bird noises in Rome. Particular sounds, such as bird noises, can be modelled in the street space. These would produce different sound dissipation curves to the ones I showed.

4. a) You do not use the term ‘soundscape’ but surely it plays a part in the social porduction of space; b) you ended with [Latin] words, but these would be aspects of the perceived sense, in a theoretical definition of ‘perception’. For example, my husband could snore and this sound would bother me, but may not bother others.

First, soundscapes: I am growing uncomfortable with the term [although, I have used it in publications]. I find its use unclear in defining its geographical extent and it being associated with cataloging all the sounds in a space (again, without reference to the flexibility of this term). That leads to the second point. Yes, ‘perception’ is culturally constituted and that is why I looked to Roman usage of metaphorical walking was associated with comportment. This offers a critique of our own reliance on visual metaphors to describe cities and urban space.

Footnotes:

[1] Lefebvre, The Production of Space (Blackwell 1991), 399-400; a point also made by Terry Eagleton but with no reference to Lefebvre, Eagleton, Materialism (Yale 2017), 62-3.

[2] cité: Lefebvre, Metaphilosophy (Verso 2016), 142, 209-215; The Production of Space (Blackwell 1991), 239; see my own review of Lefebvre’s use of Rome and the ancient city at Ancient Noise (blog, jeffdveitch.me).

[3] Laurence, Roman Pompeii: Space and Society, 2nd ed. (Routledge 2007), 103.

[4] Laurence, Roman Pompeii: Space and Society, 2nd ed. (Routledge 2007), 107-9.

[5] Poehler, ‘Measuring the Movement Economy: A Network Analysis of Pompeii’, in Flohr and Wilson (eds.), The Economy of Pompeii (OUP 2017), 204.

[6] Poehler, ‘Measuring the Movement Economy: A Network Analysis of Pompeii’, in Flohr and Wilson (eds.), The Economy of Pompeii (OUP 2017), 204.

[7] Lefebvre, Towards an Architecture of Enjoyment (University of Minnesota 2014), 149.

[8] Lefebvre, Rhythmanalysis: Space, Time and Everyday Life (Bloomsbury 2013), 21.

[9] Lefebvre, Rhythmanalysis: Space, Time and Everyday Life (Bloomsbury 2013), 21, 27, 33.

[10] Lefebvre, Rhythmanalysis: Space, Time and Everyday Life (Bloomsbury 2013), 32; cf. Lebas and Kaufman, ‘Lost in Transposition – Time, Space and the City’, in Writings on Cities (Blackwell 1996).

[11] See Libet et al, ‘Subjective referral of the timing for a conscious sensory experience: A functional role for the somatosensory specific projection system in man’ Brain 102 (1979), 191–222.

[12] Libet et al, ‘Subjective referral of the timing for a conscious sensory experience: A functional role for the somatosensory specific projection system in man’ Brain 102 (1979), 191–222.

[13] See also Thrift, Non-Representational Theory: Space, Politics, Affect (Routledge 2008).

[14] Lefebvre, Towards an Architecture of Enjoyment (University of Minnesota 2014), 151.

[15] Lefebvre, Towards an Architecture of Enjoyment (University of Minnesota 2014), 41.

[16] Eagleton, Materialism (Yale 2017), 65-6.

[17] Eagleton, Materialism (Yale 2017), 67.

[18] See Veitch, ‘Soundscape of the Street: Architectural Acoustics at Ostia, in Betts (ed) Senses of the Empire: Multisensory Approaches to Roman Culture (Routledge 2017), 54-70.

[19] Ellis, ‘Pes Dexter: Superstition and the State in the Shaping of Shopfronts and Street Activity in the Roman World’, in Laurence and Newsome (eds.) Rome, Ostia, Pompeii: Movement and Space (OUP 2011), 160-173.

[20] Pompeii, Hartnett, ‘Si quis hic sederit: Streetside Benches and Urban Society in Pompeii’, AJA (2008), 110.

[21] Pompeii, Hartnett, ‘Si quis hic sederit: Streetside Benches and Urban Society in Pompeii’, AJA (2008), 110; Ostia, Veitch, Acoustics in Roman Ostia (unpub. PhD).

[22] See DeLaine, ‘Building Activity in Ostia in the second century AD’ in Bruun and Gallina-Zevi (eds.) Ostia e Portus nelle loro relazioni con Roma (AIRF 2002), 41-102 for discussion of large-scale building at this time.

[23] See DeLaine, ‘Building Activity in Ostia in the second century AD’ in Bruun and Gallina-Zevi (eds.) Ostia e Portus nelle loro relazioni con Roma (AIRF 2002), 41-102 for dates.

[24] Macaulay-Lewis, ‘The City in Motion: Walking for Transport and Leisure in the City of Rome’, in Laurence and Newsome (eds.) Rome, Ostia, Pompeii: Movement and Space (OUP 2011), 274.

[25] Macaulay-Lewis, ‘The City in Motion: Walking for Transport and Leisure in the City of Rome’, in Laurence and Newsome (eds.) Rome, Ostia, Pompeii: Movement and Space (OUP 2011), 274-5.

[26] Tacitus Annales 15.43.1-2; Suetonius Nero 16.

[27] Lefebvre, The Production of Space (Blackwell 1991), 40.

[28] Agricola 19-21⁠; Laurence and Trifilò, ‘The Global and the Local in the Roman Empire’, in Pitts and Versluys (eds.) Globalisation and the Roman Empire (CUP 2015), 103.

[29] See Smith and Katz, Grounding Metaphor: Towards a spatialised politics’, in Keith and Pile (eds.) Place and the Politics of Identity (Routledge 1993), 67-83; Massey, Space, Place and Gender (Polity 2002).

[30] Jenkyns, God, Space and City in the Roman Imagination (OUP 2013), 148.

Porticoes, Embodiment and Street Cries: Recent work…

Image: North Cardo Maximus, facing south, towards the forum in Ostia (Jeff Veitch)

Currently, I am working on a variety of different things all at once (presentations, publications, job applications). I have not posted here as much due to these activities and some, like job applications, are not very exciting things to discuss on the blog. However there are a couple of concepts and ideas that are worth briefly discussing, in the hopes that it will motivate me to devote more time to them in the coming months. So, here are a couple of topics swimming in my head right now…

Porticoes: I have two upcoming presentations that I am working on (details here). Originally, I had planned to write two completely separate papers on different aspects of my work (motivating me to write and formulate more particular approaches, ideas, etc). Instead, the two presentations will draw on case studies of porticoes from Ostia. In preparing these presentations, I keep returning to the experienced difference of portico architecture within the social space of streets. At a basic level, the portico is shaded and separated from the street. In auditory terms, the portico and street are different auditory fields, however the two fields influence each other. When the acoustic properties of street canyons are modelled, in instances where porticoes exist, the properties show a marked progression towards the acoustic properties of Ostia’s main street, the decumanus. In a way, certain streets approach the auditory character of the decumanus with the addition of porticoes. The chronology further emphasises the experienced character of the space, which is replicated to various degrees in other places across the city. Streets that could never reach the scale of the decumanus are able to mimic its auditory experience through more controlled and smaller scale developments. I will be testing some of these ideas this next week, when I present in Kiel, Germany.

Embodiment: Several books, lectures and writings have brought embodiment back to the forefront of what I am doing. I picked up Terry Eagleton’s new book, Materialism, and he makes a case for the importance of embodiment in Marx, as well as other forms of materialism. Tied into the emphasis on embodiment is the role of the senses as ways of measuring urban space or embodiment as site of particular forms of knowledge gleaned from the senses. These are not new ideas for me, but they are beginning to crystallise in particular ways (as well as focusing my generally scattered interests). Much of these ideas will appear in my presentations coming up, although they are primarily in the background and theory behind the presentations.

Finally, street cries: Street noise is one of the primary topics in my work and one that I continue dig into. After the winter holidays, I read through a series of books on Paris in the 18th and 19th century. Street criers, sellers and vendors were a part of the landscape of the city in that period and changes to the architecture of Paris were expressed in relation to street noise. There are some parallels with the ancient world, although comparisons need to be cautiously approached. What I find most useful, however, is the theoretical implication of much of this work, which builds bridges between social, political and economic aspects of the senses and their spatial settings. In short, as the topography of Paris changes, the sensorium likewise changes; these shifts produce different social, political and economic spatialities. Rome, I would argue, undergoes parallel changes in many ways. To say that architectural changes that alter the topography of Rome change the experience of the city is obvious. However, what need further study are the particularities of these changes.

How did the addition of porticoes change the way sellers utilised street space? What are the economic implications? Or social? Or political, for that matter? Do street traders change tactics in response to the development of porticoes along streets? Some of these questions have begun to be addressed in various ways. Sarah Bond’s new book, Trade & Taboo: Disreputable Professions in the Roman Mediterranean, address aspects of social stigmas towards criers and auctioneers (praeco). In particular, Bond emphasises the changing nature of such social stigmas from the late Republic to late antiquity. The emphasis on changing stigmas, parallels my own interest in changing urban forms. In a different context, Arjan Zuiderhoek, in The Ancient City (part of the Key Themes in Ancient History series), discusses (briefly) street sellers in terms of a wider understanding of ancient cities. Zuiderhoek covers a similar longue durée of ancient history, although he highlights continuity in city formations, focusing instead more on the archaeological material and current debates. Both are recent publications, which highlight some of the areas for further investigation.

Hopefully, in the coming months some of these ideas will formulate into even more coherent research agendas, possible publications and further blog posts. In the meantime, it’s back to presentation prep and editing a chapter due by the end of the month…

Some Thoughts on 3D Models, or Putting 3D Models to Research Use

I have an unease with ‘historical reconstructions’, 3D modelling and VR/AR of historical remains that centres on questions of research (see here). This is not to say such reconstructions are ‘bad’, but they seem to be an end-in-themselves. The reconstruction is a way of visualising the total understanding of ‘X’ (whether a building, street, city, etc.) and that is that. No further questions.

However, this reduces the reconstruction to nothing more than a pretty spreadsheet. Yes, a very pretty spreadsheet, but an expensive catalogue of archaeological remains (like this). Instead, I see the ‘tool’ side of models as their primary purpose. Models can be used as a tool to critically evaluate the ancient remains in a way other forms of research do not. As an example, a friend posted this NY Times article on mapping the shadows of buildings in NYC. It is a fascinating read about the effects of the skyline in everyday choices, movements, and, most important for NYC, property values.

‘Sunlight and shadow shape the character and rhythm of New York’s public spaces. They have the power to control the flow of foot traffic on our city streets and decide which plazas hum with activity and commerce and which stay barren and desolate. And probably most noticeably, they have the power to change the rent.’ (Bui and White).

Air and sunlight are, for NYC, commodities that shape the value of a property. I was immediately drawn to Roman law. Air and sunlight were legal requirements that restricted extensions to buildings (Dig. 7.1.30; 39.2.25; 8.2.11) and Vitruvius discuss the placement of certain rooms based on seasonal sunlight patterns (De Arch. 6.3.11; 6.6.6). The importance of air and sunlight were recognised by the Romans and this importance worked its way into law. This process from lived experience to legal requirement can be seen in terms of the commodification of sunlight similar to NYC (although, not in the same capitalist sense).

In my own research, I have looked at some of the social processes (all related to sounds) that shaped the way the ancient urban environment was constructed. Sunlight is an example of a natural process (non-built) that shapes social interaction in urban space. It is that point, the non-built aspect of sunlight in relation to physical buildings that allows for models to be a critical tool. I can stand in Ostia and track the movement of the sun’s path, but by modelling the building and sun’s path, I can question building heights influence on street space, or requirement of internal lighting for room usage, or even hypothesise relative values based on direct sunlight in comparison with other buildings. The list goes on the more you think about (as I have found out…). So, with the legal requirement of light and the archaeological remains of Ostia (as well as a question from a friend), I went fishing for sun path models to apply to Roman buildings.

It did not take long to find Andrew Marsh’s blog, which has a web-based app for 3D sun path analysis. As the sun’s path is based on the geographical location of the space in question, the app uses Google earth to pull coordinates (top left in the screenshot below). There is a map of the daylight length (bottom left) and a moveable 3D model of a multifunctional urban space (right). The 3D is centred on the building in red and set on a compass so, you can orient it, if you like (I set it roughly to the orientation of the site so, I did not confuse myself).

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Sun-path for the Portico di Pio IX in Ostia on 12 Jan. at 10:30am (from http://andrewmarsh.com/apps/staging/sunpath3d.html)

I selected the Portico di Pio IX on the north card maximus in Ostia (see here, here and a forthcoming chapter here) and tomorrows date (12 Jan.) at 10:30am. The day length is relatively narrow and the suns path is rather low in the sky, running from 120∘ (SE) – 240∘ (SW). This creates long shadows to the west in the morning appearing between 8:10-20, direct sunlight down the street at midday, and long shadows to the east in the evening until sunset around 16:30-40. This forms the basic outline of sunlight throughout the day (at this point in the yearly cycle).

Now, what are missing in this scenario are the buildings along the cardo maximus. The mixed-use urban space in the 3D model is instructive, but only if you know the buildings on the street (this is where models become more than pretty pictures). Now, the cardo is an open space (8 m wide and 130 m long) with two identical buildings on either side (rows of 8 shops with a portico in front). At midday (12:00), the sun would be reaching its peak, almost due south of the street. Two things come to mind; 1) this indicates that the temple (Capitolium) in the forum would receive direct sunlight to its facade and steps, while 2) casting a long shadow down the cardo. This feature would not change throughout the year, as at the summer solstice and winter solstice the sun’s position, at midday, remains in the southern region of the sky.

I also found a dynamic daylight analysis app on Marsh’s blog, which allows one to simulate daylight in a simple room (initial release so just a square room). So, I built a shop in the Portico di Pio IX and set a window to the size of the front door (as there is no ‘door’ in the model).

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Dynamic daylight model of a shop (Portico di Pio IX) (from http://andrewmarsh.com/apps/staging/daylight-box.html)

The shops in the Portico di Pio IX had two levels (a mezzanine space above the ground floor); the model is of the ground floor area, under the mezzanine. Again, the app allows you to mess with the orientation and you can adjust all the elements as needed. The result, shown above, is as expected. A high daylight factor (DF) in the area around the shutters with the work plane height set at 1 m. The DF range is between 2.7% and 23.9% with an average of 5.7%. The DF is the ratio of light inside to light outside the room (a calculation used in architectural design. There are slight changes to the DF ratios as the work plane changes (avg increase to 6.8% at 0.05 m from the floor) and at a work plane height of 2.135 m the DF avg drops to 4%.

As an example, I placed the work plane height at 0.85 m, which corresponds to several bar counter heights in Ostia (see Hermansen 1982). The result is interesting, or at least allows for some comment. At 3 m into the shop, the DF is in the range of 6-8%, suggesting that natural light would light a counter (as counters were under 3 m in length).

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Dynamic daylight in shop (Portico di Pio IX) with a work plane height of 0.85 m (highlighted in red; bar counter height) and DF contour grid in 3D. (From http://andrewmarsh.com/apps/staging/daylight-box.html)

What is missing, which will change this model, is the portico space in front of the shop. As seen in the sun-path, there will be little direct sunlight into the shops along the Portico di Pio IX. In particular, the shops on the westside will get early morning sunlight and the westside, evening sunlight. The portico will block much of the light at these times, however in the midday sun, it will provide needed shade (as anyone who has worked in Italy in August can attest). What this model does suggest is that choices, such as counter height, could be dictated by natural light, and importantly, the heating capacity of natural light. Although, in the case of the Caseggiato del Termopolio (1.2.5; the most well-known bar in Ostia) it’s counter and space orientation will never receive direct sunlight. What we might begin to see is the material remains of the ‘commodification’ (for lack of a better term) of sunlight within an ancient context.

Finally, it is worth returning to the start of this post. 3D models and reconstructions are useful and helpful for historical research. The discussion here has benefited directly from such modelling techniques, although, as stated, it was the need to move past the image, fly-through, or even simply trying to document every element within the model that drove my interest. We need to push the utility of 3D models and reconstructions for critical questioning of our own academic assumptions and start to use them for addressing new modes of enquiry and topics of interest, rather than as an end in-themselves.

Sounds (or Noise) in Streets

In a previous post I discussed the influence of shop doors on the acoustics of the space. The basis analysis and methodology will be published in a forthcoming edited volume (hopefully in June). Recently, I have been exploring the acoustics beyond the facade or shop front and looking at street noise. Much of the methodological approach remains the same; dimensions and construction material form the baseline of the acoustic analysis. However, certain elements are missing in street canyons that mean sounds react in different ways to the space.

First, the lack of covered or enclosed space means that large areas will not reflect sounds. It is a basic feature of streets that they are open to the sky and rarely covered. In acoustic terms, this means that much of the sound will dissipate over distance, as opposed to being absorbed by the physical walls or ceilings, as happens in enclosed rooms.

Despite the lack of covering, the pavement and building facades will reflect and absorb the sounds and noises of the street. In contemporary acoustic design, traffic noise is the primary nuisance, which acoustic designers and architects try to limit. It was, in fact, the high levels of traffic noise that began the search for standard acoustic measures. Emily Thompson has a fantastic book, *The Soundscape of Modernity*, that charts the history acoustics as a field in the start of the modern period.

In terms of ancient streets, in a similar manner to enclosed spaces the types of materials can be assessed for their absorption coefficient, a standard measure of a materials ability to absorb sound. These basic elements can again be plugged into a predicative equation to measure the absorption.

The second deficulty with streets is the complexity of the arrangements. Even building facades present a complex sound field with various surfaces, materials and architectural features. In Ostia, several buildings have monumental entrances with pillars, columns, or pedestals and some times all three. These features will change the way the sound reflects off the surface. Even more problematice, although I do really like the challenge, is the widespread use of colonnades or porticos. The space of the portico is, again, partially covered and partially open. This means that sounds from the street can fill the portico, as well as sounds within the portico only being heard in close proximity to the space. The nature of porticos present their own acoustic character, quite unlike other street spaces.

It has been fun to explore the ways these acoustic features of streets, and porticos, can help us to better understand the street as a social space. I have just begun to map the effects of conversation noise in certain streets in Ostia and I will post an update as I write more about the street space. I will be presenting some of these findings this weekend in Umea, Sweden.

Ancient ‘House Parties’ or Explaining the use of crowd noise predictors

Currently, I’m still working on my chapter covering internal acoustics of various spaces in Ostia. My last post touched on the role of doors in shops, one of the spaces I analyse, and now I’m working through the various forms of residential structures, mainly houses and apartments. I pulled an older study of apartments and houses in Ostia off the shelf and started going back through bits of study, especially the authors discussion of particular apartments. While the architectural discussion was useful, I was more fascinated by one of the appendices, which had every building in Ostia with the authors calculation of inhabitants. Each building had a suggested height (# of stories), number of flats and total number of inhabitants. This was just the sort of random list I find fascinating and started playing around with the population numbers. Where was the densest population in the city? Which building had the most people? What was the average number of people per building in each of the five regions of Ostia? And finally, what would the range of noise levels if I ran the population numbers through a crowd noise prediction formula?

This final question lead me to start yet another spreadsheet with the all the buildings and their corresponding crowd noise prediction levels. As expected the range of noise levels was fairly consistent, as the per building population numbers were also fairly consistent. But once I had my spreadsheet, I figured I would map the predictive noise onto a few neighbouring buildings and see what would happen. I quickly realised that I had a couple of problems I need to address. Was I going to assume all the inhabitants were in the same space, as the crowd prediction formula assumed, or would I rerun the formula for each individual habitation on each floor. Thus, and for the sake of entertainment, I assumed that each building had it’s own ‘house party’ with all the inhabitants from that building in one flat! It was perfect! An ancient frat party in each building and now I had something even better to find in mapping the sounds. Where would you go to read a book away from all the noise? Having looked at the acoustics of the internal spaces and having worked out the noise levels for my ancient ‘house party’, I sought to find the quietest place where my ancient equivalent would go to get away from all those people.

I’m not sure how my supervisors will feel about my referring to crowd noise predictions as ‘house parties’ but it was entertaining.

VLAC Conference

© Will Foster Illustration
© Will Foster Illustration

Yesterday, I spent the day at the Burlington House (home of the Royal Academy of Art and several other societies) for a conference for Visualizing the Late Antique City, a three year research project at University of Kent (http://visualisinglateantiquity.wordpress.com). The project is, in many ways, right up my alley; the director being one of my supervisors to start with. The conference was an opportunity for the researchers to share their work from the last three years, as many of them will be finishing this year and only limited aspects of the project will continue. The project, itself, looks at urban life from the 4th – 6th centuries drawing together various sources of evidence to visually display the rhythms and patterns of everyday living around the Mediterranean.

The broad division of the day was into short sessions on specific architectural topics, like public space, houses, shops, etc. There was a paper on the physical structures, either the decoration or aspects of reconstruction or both. This was followed by a paper on the material culture and objects found connected with the activities held in the spaces. Of note, Jo Stonner drew attention to household objects and the possible meanings to individual owners, especially items associated with wedding gifts and heirlooms. While Joe Williams used the objects associated with trades to narrate the various lives of shopkeepers who worked along a porticoed street. The interaction between spaces and activities was, therefore, brought to the forefront. Faith Morgan, who looked at late antique garments, had made reconstructions of several of the textiles she studied and had members of the research project display them in a late antique fashion show. The illustrators, as well as a 3-d modeler working on Constantinople, also shared the challenges and opportunities available to academics based on the process of designing and illustrating scenes and cities. The conference ended with a walk through Ostia in AD 387 based on St Augustine’s Confessions, book 9. This was particularly interesting to think about the ways research can be used to share the technical work of archaeology to wider audiences. My own research in Ostia parallels much of the work done by the VLAC project and it was helpful to see the illustrations and hear some of the work that went into this project.

Its worth looking at the VLAC website to see some of the illustrations and read more about the individual researchers and their contributions. The project is continuing to produce illustrations and are working on several buildings in Ostia, including the Caseggiato del Termopolio (http://www.ostia-antica.org/regio1/2/2-5.htm) a bar with counters and outdoor seating… my kind of place!