This full paper is submitted and accepted at the TEI2007 conference in Baton Rouge, New Orleans. The paper - Reclaiming Public Space - Designing for Public Interaction with Private Devices - discusses how private mobile devices can take part in reclaiming parts of the public space that is regulated solely by commercial interests. The paper is written by Thomas Riisgaard Hansen, Eva Eriksson and I. Abstract Public spaces are changing from being ungoverned places for interaction to be more formalized, controlled, less interactive, and designed places aimed at fulfilling a purpose. Simultaneously, new personal mobile technology aims at providing private individual spaces in the public domain. In this paper we explore the implications of interacting in public space and how technology can be rethought to not only act as personal devices, but be the tool to reclaim the right and possibility to interact in public spaces. We introduce information exchange, social support and regulation as three central aspects for reclaiming public space. The PhotoSwapper application is presented as an example of a system designed to integrate pervasive technology in a public setting. The system is strongly inspired by the activities at a traditional market place. Based on the design of the application we discuss four design challenges when designing for public interaction. Read the entire paper in pdf here