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In the everyday world, much of what we do is dictated by how we interpret spatial relationships, or proxemics. What is surprising is how little proxemics are used to mediate people's interactions with surrounding digital devices. We imagine proxemic interaction as devices with fine-grained knowledge of nearby people and other devices -their position, identity, movement, and orientation -and how such knowledge can be exploited to design interaction techniques. In particular, we show how proxemics can: regulate implicit and explicit interaction; trigger such interactions by continuous movement or by movement of people and devices in and out of discrete proxemic regions; mediate simultaneous interaction of multiple people; and interpret and exploit people's directed attention to other people and objects. We illustrate these concepts through an interactive media player running on a vertical surface that reacts to the approach, identity, movement and orientation of people and their personal devices.

The increasing number of digital devices in our environment enriches how we interact with digital content. Yet, crossdevice information transfer -which should be a common operation -is surprisingly difficult. One has to know which devices can communicate, what information they contain, and how information can be exchanged. To mitigate this problem, we formulate the gradual engagement design pattern that generalizes prior work in proxemic interactions and informs future system designs. The pattern describes how we can design device interfaces to gradually engage the user by disclosing connectivity and information exchange capabilities as a function of inter-device proximity. These capabilities flow across three stages: (1) awareness of device presence/connectivity, (2) reveal of exchangeable content, and (3) interaction methods for transferring content between devices tuned to particular distances and device capabilities. We illustrate how we can apply this pattern to design, and show how existing and novel interaction techniques for cross-device transfers can be integrated to flow across its various stages. We explore how techniques differ between personal and semi-public devices, and how the pattern supports interaction of multiple users.

The goal of Spybuster is to provide a powerful and easy accessible community platform, which helps the members to cope with the increasing number of threats for everyone's privacy in everyday life. Spybuster uses a geotagging system to associate privacy threats with their locations. Users can add supplemental information such as a description of the threat and the exact address. The resultant tags can either be accessed over a mobile application with an interactive radar or a website using a Google Maps-mashup for displaying tags in a certain area. Due to a shared database users can organize their tags on both platforms. Categories and Subject Descriptors H.5.0 [INFORMATION INTERFACES AND PRESENTATION]:General: information interface for a mobile and a web platform. General TermsDesign, Security

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