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In this paper, we present a novel device concept that features double-sided displays which can be folded using predefined hinges. The device concept enables users to dynamically alter both size and shape of the display and also to access the backside using fold gestures. We explore the design of such devices by investigating different types and forms of folding. Furthermore, we propose a set of interaction principles and techniques. Following a usercentered design process, we evaluate our device concept in two sessions with low-fidelity and high-fidelity prototypes.

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Bend, stiffen, resize (b) EarPut (inside) (c) Augmented Earphones (d) Augmented Glass (a) EarPut Wireless Sensor Arc-shaped Board (12 Touch Points) Wire Flexible form factor Figure 1: (a) EarPut is a novel interface concept and hardware prototype that instruments the ear as an interactive surface for touch-based interactions. (b) The flexible form factors allows users to bend and stiffen the earpiece to account for differently shaped ears. (c) EarPut serves as an interaction enabler for otherwise non-interactive devices such as ordinary earphones. (d) It complements interaction capabilities of head-worn devices, e.g. as an extension to Glass' touch-enabled frame.

We contribute Permulin, an integrated set of interaction and visualization techniques for multi-view tabletops to support co-located collaboration across a wide variety of collaborative coupling styles. These techniques (1) provide support both for group work and for individual work, as well as for the transitions in-between, (2) contribute sharing and peeking techniques to support mutual awareness and group coordination during phases of individual work, (3) reduce interference during group work on a group view, and (4) directly integrate with conventional multi-touch input. We illustrate our techniques in a proof-of-concept implementation with the two example applications of map navigation and photo collages. Results from two user studies demonstrate that Permulin supports fluent transitions between individual and group work and exhibits unique awareness properties that allow participants to be highly aware of each other during tightly coupled collaboration, while being able to unobtrusively perform individual work during loosely coupled collaboration.