The increasing number of media facades in urban spaces offers great potential for new forms of interaction especially for collaborative multi-user scenarios. In this paper, we present a way to directly interact with them through live video on mobile devices. We extend the Touch Projector interface to accommodate multiple users by showing individual content on the mobile display that would otherwise clutter the facade's canvas or distract other users. To demonstrate our concept, we built two collaborative multi-user applications: (1) painting on the facade and (2) solving a 15-puzzle. We gathered informal feedback during the ARS Electronica Festival in Linz, Austria and found that our interaction technique is (1) considered easy-to-learn, but (2) may leave users unaware of the actions of others.

In this paper we describe a prototype for the simple and playful exploration of various interaction modalities with colored light.

Museums often use mobile devices and applications to let visitors explore their exhibits and interact with them in order to make the user experience more immersive and enjoyable. This paper presents a mobile museum guide based on the physical interaction with a dynamic NFC-display, consisting of a grid of NFC-tags and a projected GUI. Visitors can browse tours on the public display, download them onto their mobile devices and use them for the exploration of the museum. The paper presents the design of the museum guide, a first prototype and a preliminary evaluation of its usability and the interaction with a dynamic NFC-display.