Virtual reality (VR) can be defined as interactive computer graphics that provides viewer-centered perspective, large field of view and stereo. Head-mounted displays (HMDs) and BOOMs™ achieve these features with small display screens which move with the viewer, close to the viewer's eyes. Projection-based displays [3, 7], supply these characteristics by placing large, fixed screens more distant from the viewer. The Electronic Visualization Laboratory (EVL) of the University of Illinois at Chicago has specialized in projection-based VR systems. EVL's projection-based VR display, the CAVE™ [2], premiered at the SIGGRAPH 92 conference.In this article we present two new, CAVE-derived, projection-based VR displays developed at EVL: the ImmersaDesk™ and the Infinity Wall™, a VR version of the PowerWall [9]. We describe the different requirements which led to their design, and compare these systems to other VR devices.

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I n this paper we present a virtual mail (v-mail) system. T h e prototype system is developed to realize e f icient "handing-off'' of work between participants that are separated by great distances and/or tame zones.

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Human Trials" is a networked, virtual, intermedia drama with human actors, intelligent agents and smart sets. The drama explores the intersection of virtual reality and embodied performance through an event designed both as an immersive experience for one participant, and as a non-immersive production for a live audience. This structural duality highlights the meta-theatricality potential of virtual reality performance and those outside it.