In this paper, we address the problem of designing for participation and parallel interaction with a walk-up-and-use tabletop system in a public exhibition environment. Motivated by the work practice of territoriality, we implement a novel, tabletop-integrated multi-user tracking system that provides data on a user's location and movement. Based on this robust hardware and software implementation, we present an interaction design that assigns a visually separated display space to each user, the space serving them as a personal territory. These territories can serve as affordances for initiating interactions; most notably they can support the multi-user coordination process during parallel co-located information exploration, which has been observed in our preliminary evaluation.

Large Interactive Displays (LIDs), such as tabletops or interactive walls, are promising innovations, which are increasingly used to support colocated collaboration. Yet the current evidence base on the impact of LID use on collaborative processes and outcomes, and associated

In this note we introduce Body Panning, a novel interaction technique for horizontal panning on interactive surfaces. Based on an established sensory hardware setup, we implemented a robust body tracking system for a largescaled tabletop. On this basis a user can pan through a spatial user interface by adjusting her position at the table. As a natural form of interaction, this technique is convenient and applicable to many existing use cases and applications, as we will present in this note. Besides, we expected to see positive effects on the user's navigational and spatial memory performance. We conducted an experiment between a common touch panning and a body panning interface to find out about differences in these performances. For the body panning condition, we observed an increased spatial memory performance and an invariant navigation performance. We present and discuss these results focusing on application domains for the body panning technique.

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Physical tools and materials like pen, paper, sticky-notes, and whiteboards are commonly used in collaborative creative design processes, whereas digital tools play a more marginal role. But what are the benefits and drawbacks of physical, digital, and hybrid physical-digital setups when it comes to supporting collaborative ideation? To answer this question, we present a study and analysis of three different implementations of a well-established collaborative ideation technique called Inspiration Card Workshop, with physical, digital, and hybrid setups. Each setup is a controlled experiment with three different groups of designers. We analyse the setups in terms of how they support five key aspects of collaborative design. Based on our insights, we present implications for future use of digital tools to support card-based collaborative design ideation, in which we argue for a technically lightweight hybrid workflow setup that builds on well-proven physical and digital components.