Members of a theater audience see themselves in amirror image projected on to a large screen. This`mirror' is augmented by virtual balls that bouncerealistically when hit by the audience. The effect iscreated with a computer and a single camera. It isrobust and convincing and we have devised severaldifferent games that an audience can play.Since 2005, we have displayed these games pub-licly at two international science fairs, and to manystudent groups. We usually explain the rules ofthe games briey, but even this is hardly necessary.People learned to manipulate the virtual objects in-tuitively and could infer the rules of scoring in onlya few minutes. Our games encourage cooperationand provide an enjoyable, active group experiencewithout making individuals self conscious.
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