Mobile photo sharing through collaborative space in stereoscopic 3D

Mobile user interfaces (UIs) utilizing stereoscopic 3D have so far been driven predominantly by visual design, and when interaction design has been considered, the focus has been on single user use cases. In this paper, we introduce a novel way to utilize stereoscopy in a mobile user interface in a collaborative task. We define a shared space, appearing below the screen level, which is used in a collaborative task of sharing mobile phone photos. Two users are able to share content by moving items between the private layer, at zero parallax, and shared layer, at positive parallax. We developed the application through an iterative design process including two user studies (n=27, n=19). We report positive evaluation results especially in regard of the utilitarian aspects of the UI design.