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Increasing amounts of information processing capacity are embedded in the environment around us. The informational landscape is both a repository of data and also increasingly communicates and processes information. No longer confined to desk tops, computers have become both mobile and also disassembled. Many everyday objects now embed computer processing power, while others are activated by passing sensors, transponders and processors. The distributed processing in the world around us is often claimed to be a pervasive or ubiquitous computing environment: a world of ambient intelligence, happening around us on the periphery of our awareness, where our environment is not a passive backdrop but an active agent in organizing daily lives. The spaces around us are now being continually forged and reforged in informational and communicative processes. It is a world where we not only think of cities but cities think of us, where the environment reflexively monitors our behaviour. This paper suggests that we need to unpack the embedded politics of this process. It outlines the three key emerging dynamics in terms of environments that learn and possess anticipation and memory, the efficacy of technological mythologies and the politics of visibility. To examine the assumptions and implications behind this the paper explores three contrasting forms of ‘sentient’ urban environments. The first addresses market-led visions of customized consumer worlds. The second explores military plans for profiling and targeting. Finally, the third looks at artistic endeavours to re-enchant and contest the urban informational landscape of urban sentience. Each, we suggest, shows a powerful dynamic of the environment tracking, predicting and recalling usage.

A significant body of research has addressed whether fixed internet use increases, decreases or supplements the ways in which people engage in residential and workplace settings, but few studies have addressed how wireless internet use in public and semi-public spaces influences social life. Ubiquitous wi-fi adds a new dimension to the debate over how the internet may influence the structure of community.Will wireless internet use facilitate greater engagement with co-located others or encourage a form of 'public privatism'? This article reports the findings of an exploratory ethnographic study of how wi-fi was used and influenced social interactions in four different settings: paid and free wi-fi cafes in Boston, MA and Seattle,WA.This study found contrasting uses for wireless internet and competing implications for community.Two types of practices, typified in the behaviors of 'true mobiles' and 'placemakers', offer divergent futures for how wireless internet use may influence social relationships.

Contemporary mobile-phone technology is becoming increasingly similar around the world. However, cultural differences between countries may also shape mobile-phone practices. This study examines a group of variables connected to mobile-phone use among university students in Sweden, the USA and Japan. Key cultural issues addressed are attitudes towards quiet in public space, personal use of public space and tolerance of self-expression. Measures include the appropriateness of using mobiles in various social contexts and judgments of what respondents like most and like least about having a mobile phone. Analysis revealed a number of culturally associated differences, as well as a shared conflicting attitude towards the advantages and disadvantages of reachability by mobile phone.

As augmented reality (AR) is becoming technologically possible and publicly available through mobile smartphone and tablet devices, there has been relatively little empirical research studying how people are utilizing mobile AR technologies and forming social practices around mobile AR. This study looks at how mobile AR can potentially mediate the everyday practices of urban life. Through qualitative interviews with users of Layar, a mobile AR browser, we found several emerging uses. First, users are creating content on Layar in ways that communicate about and through place, which shapes their relationship and interpretations of places around them. Second, we found a growing segment of users creating augmented content that historicizes and challenges the meanings of place, while inserting their own narratives of place. Studying emerging uses of AR deepens our understanding of how emerging media may complicate practices, experiences, and relationships in the spatial landscape.

The development and proliferation of mobile social networks have the potential to transform ways that people come together and interact in public space.These services allow new kinds of information to flow into public spaces and, as such, can rearrange social and spatial practices. Dodgeball is used as a case study of mobile social networks. Based on a year-long qualitative field study, this article explores how Dodgeball was used to facilitate social congregation in public spaces and begins to expand our understanding of traditional notions of space and social interaction. Drawing on the concept of parochial space, this article examines how ideas of mobile communication and public space are negotiated in the everyday practice and use of mobile social networks.

Location-aware mobile media allow users to see their locations on a map on their mobile phone screens. These applications either disclose the physical positions of known friends, or represent the locations of groups of unknown people. We call these interfaces eponymous and anonymous, respectively. This article presents our classification of eponymous and anonymous location-aware interfaces by investigating how these applications may require us to rethink our understanding of urban sociability, particularly how we coordinate and communicate in public spaces. We argue that common assumptions made about location-aware mobile media, namely their ability to increase one’s spatial awareness and to encourage one to meet more people in public spaces, might be fallacious due to pre-existing practices of sociability in the city. We explore these issues in the light of three bodies of theory: Goffman’s presentation of self in everyday life, Simmel’s ideas on sociability, and Lehtonen and Mäenpää’s concept of street sociability.

The rise of mobile food vending in US cities combines urban space and mobility with continuous online communication. Unlike traditional urban spaces that are predictable and known, contemporary vendors use information technology to generate impromptu social settings in unconventional and often underutilized spaces. This unique condition requires new methods that interpret online communication as a critical component in the production of new forms of public life. We suggest qualitative approaches combined with data-driven analyses are necessary when planning for emergent behavior. In Charlotte, NC, we investigate the daily operations, tweet content, and spatial and temporal sequencing of six vendors over an extended period of time. The study illustrates the interrelationship between data, urban space, and time and finds that a significant proportion of tweet content is used to announce vending locations in a time-based pattern and that the spatial construction of events is often independent of traditional urban form.

Cellphones provide a unique opportunity to examine how new media both reflect and affect the social world. This study suggests that people map their understanding of common social rules and dilemmas onto new technologies. Over time, these interactions create and reflect a new social landscape. Based upon a year-long observational field study and in-depth interviews, this article examines cellphone usage from two main perspectives: how social norms of interaction in public spaces change and remain the same; and how cellphones become markers for social relations and reflect tacit pre-existing power relations. Informed by Goffman's concept of cross talk and Hopper's caller hegemony, the article analyzes the modifications, innovations and violations of cellphone usage on tacit codes of social interactions.

City beaches are produced by spreading sand, deckchairs and umbrellas onto industrial brownfields, parking lots, rights-of-way or other under-utilized open spaces. Where major reinvestment projects are lacking, these informal developments offer great amenity. This approach to placemaking is post-Fordist. It is highly flexible, even mobile. It involves complex, temporary networks of people and resources. It focuses on ‘soft’ content—services, programmes, themes, atmosphere—rather than inflexible built form. This enables rapid innovation. Through four case studies, the paper explores the roles and relationships among diverse actors—city mayors, entrepreneurs, property developers, grass-roots organizations, think-tanks and planners—in the production of city beaches, and identifies what new policies, tools and management approaches they require.

This article interrogates the emerging modes of civic engagement connected to the mobile camera-phone, and the ways in which they require us to rethink what it is to bear witness to brutality in the age of fundamentally camera-mediated mass self-publication. I argue that the camera-phone permits entirely new performative rituals of bearing witness, such as dissenting bodies en masse recording their own repression and, via wireless global communication networks, effectively mobilizing this footage as graphic testimony in a bid to produce feelings of political solidarity. Critically, the performance of what I elect to call ‘citizen camera-witnessing’, as exemplified by contemporary street opposition movements including those in Burma, Iran, Egypt, Libya and Syria, derives its potency from the ways it reactivates the idea of martyrdom: that is, from its distinct claim to truth in the name of afflicted people who put their bodies on the line to record the injustice of oppression.

As one of 725 UNESCO World Heritage Properties, Antigua, Guatemala, is subject to local international regulations related to building codes and how streets and public places are occupied. These regulations are discussed within the theoretical framework of spatial governmentality to explore that relationship between governance and Maya street vendors’ economic practices. I situate the scholarly discussion of spatial governmentality within a specific economic context by highlighting how street economies are affected by what Foucault calls the “era of ‘governmentality,’” especially in an ethnographic context. In this article, I argue that horizontal and vertical forms of governmentality affect the economic practices of street vendors within Antigua’s sociopolitically constructed spaces. Understanding how spatial governmentalities work in a particular place helps explain why street economies persist and why new ones emerge. In Antigua’s case, a new mobile form of street vending emerged because of newly implemented municipal regulations and policing priorities.

Internal migration within Asian countries and international migration to, within, and out of Asia have been on the rise throughout the past decades. As types and pathways of migration, migrants’ sociocultural and socioeconomic backgrounds, and their transnational and translocal trajectories become increasingly diverse, a majority of them move to cities. Diverging power geometries and relations are constantly negotiated and (re)produced in the sociospatial dialectic of the city. Through their individual and collective agency, assets, and knowledge, mobile subjects have become important agents in the (re)production of spaces in cities, whereas the socio-political and physical conditions of spaces frame their livelihoods, opportunities, and agency. Research on migrants’ agency has intensified recently, but the specific modes through which agency operates in the socio-spatial dialectic still need to be conceptualised. We develop a framework that outlines different modes through which agents and space interact. The framework is exemplified through papers on case studies from Dhaka and the Pearl River Delta (PRD) that are part of this special issue. Dhaka and the PRD have been characterised by accelerated growth throughout the past decades, particularly due to the influx of rural-to-urban migrants, but they also receive an increasing number of international migrants. We conclude that through their diverse, multi-sited, and translocal relations and activities stretching beyond the receiving cities in a context of constant transformation, migrants’ practices contribute to the emergence of a specific type of urban spaces that we delineate as transient urban spaces.

Since the early 2000s, the proliferation of cameras, whether in mobile phones or CCTV, led to a sharp increase in visual recordings of human behavior. This vast pool of data enables new approaches to analyzing situational dynamics. Application is both qualitative and quantitative and ranges widely in fields such as sociology, psychology, criminology, and education. Despite the potential and numerous applications of this approach, a consolidated methodological frame does not exist. This article draws on various fields of study to outline such a frame, what we call video data analysis (VDA). We discuss VDA’s research agenda, methodological forebears, and applications, introduce an analytic tool kit, and discuss criteria for validity. We aim to establish VDA as a methodological frame and an interdisciplinary analytic approach, thereby enhancing efficiency and comparability of studies, and communication among disciplines that employ VDA. This article can serve as a point of reference for current and future practitioners, reviewers, and interested readers.