Hard and Soft Tangibles: Mixing Multi-touch and Tangible Interaction in Scientific Poster Scenarios.

Research on tangible user interfaces commonly focuses on tangible interfaces acting alone or in comparison with multi-touch or graphical interfaces. In contrast, hybrid approaches can be seen as the norm for established "mainstream" interaction paradigms. This paper proposes interfaces that support complementary use of physical and virtual interaction modalities with tangible and multi-touch interactions. We describe prototypes involving capacitively-sensed surfaces combined with laser-cut and 3D-printed dial-like tangibles. We employ them in the context of several computationally-mediated scientific poster scenarios, which we argue to have a number of attractions for such deployments. We present two platforms: one templated, the other highly customizable, supporting both tangible and multi-touch interactions across horizontal and vertical displays. We explore users' interaction modality choice among the options presented, draw lessons and challenges from posters developed by students, and consider future directions.