This paper presents a desktop virtual reality system featuring head-coupled movement parallax on three orthogonal screens. Virtual objects are displayed in front of the screens and are thus accessible to the user's hand. As the three-dimensional impression is based on movement parallax rather than stereo, very little headware is required. Although currently limited to visualization, the system allows the possibility to implement direct instrumental manipulation rather than manipulation through conventional pointing devices such as a mouse or a trackball. The benefits of a united display and manipulation space are discussed. A technical description of the set-up is given. (C) 1997 Elsevier Science B.V.
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