In this paper, we present TeleHuman, a cylindrical 3D display portal for life-size human telepresence. The TeleHuman 3D videoconferencing system supports 360 degree motion parallax as the viewer moves around the cylinder and optionally, stereoscopic 3D display of the remote person. We evaluated the effect of perspective cues on the conveyance of nonverbal cues in two experiments using a one-way telecommunication version of the system. The first experiment focused on how well the system preserves gaze and hand pointing cues. The second experiment evaluated how well the system conveys 3D body postural information. We compared 3 perspective conditions: a conventional 2D view, a 2D view with 360 degree motion parallax, and a stereoscopic view with 360 degree motion parallax. Results suggest the combined presence of motion parallax and stereoscopic cues significantly improved the accuracy with which participants were able to assess gaze and hand pointing cues, and to instruct others on 3D body poses. The inclusion of motion parallax and stereoscopic cues also led to significant increases in the sense of social presence and telepresence reported by participants.

While large flat vertical displays may facilitate persistent public sharing of work, they may do so at a cost of limited personal display space when everyone can see each other's activity. By contrast, new form factors, such as spherical displays, support sharing display space by limiting the user's view to at most one hemisphere. In this paper, we investigate how different interactive large display form factors can support differences in sharing of information during competitive and cooperative task conditions. We implemented three different large display types: spherical, flat, and a flat display with divider. Results show that task performance of the flat display with divider did not differ significantly from that of the spherical display. Additionally, we implemented and compared three peeking techniques that facilitated sharing of information. Results show participants peeked significantly more in competitive tasks than they did in cooperative tasks. Usage of peeking techniques between the spherical display and the flat display with divider were similar, and distinct from that of the flat display. Not surprisingly, results show that the affordance of easily glancing at a partner's work on the flat display provided a significant advantage in cooperative tasks.

It is important for users to understand the fundamental tradeoff between sharing information and preserving privacy in collaboration. The more information is shared about one's actions, the less privacy is preserved. Sharing information may, in fact, counter-intuitively result in increased social stress in some cases. Maintaining privacy while allowing for the sharing of information is an important consideration for successful collaboration and we believe display form factor matters for this tradeoff. New form factors such as spherical displays support privacy naturally, by limiting a user's view to at most one hemisphere. In this video we show how different types of interactive large display form factor can provide a balance between privacy and the sharing of information in a cooperative game.