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Sphere is a multi-user, multi-touch-sensitive spherical display in which an infrared camera used for touch sensing shares the same optical path with the projector used for the display. This novel configuration permits: The enclosure of both the projection and the sensing mechanism in the base of the device, and easy 360-degree access for multiple users, with a high degree of interactivity without shadowing or occlusion. In addition to the hardware and software solution, the authors present a set of multi-touch interaction techniques and interface concepts that facilitate collaborative interactions around Sphere.
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