"Greg Niemeyer, Dan Perkel, Ryan Shaw, and Jane McGonigal. 2005. Organum: individual presence through collaborative play. In Proceedings of the 13th annual ACM international conference on Multimedia (MULTIMEDIA '05). ACM, New York, NY, USA, 594-597. DOI=10.1145/1101149.1101286 http://doi.acm.org/10.1145/1101149.1101286" Organum Playtest is an interactive installation in which three players collaboratively navigate through a model of the human voice box, using their voices as a joystick. By asking players to solve collaborative maze puzzles through cross-functional control, voice interaction and non-verbal communication, Organum Playtest generates novel relationships between individuals, groups and audiences. The game shows how individuals can interact with abstract data forms collectively and perform distinctly on several layers of interaction. The researchers refer to this process as polyvalent performance. Players perform as individuals interacting with graphics, as individuals interacting with a group, and as a group interacting with an audience, thus achieving a "tangible sense of beneficial (...) collaboration"

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