The device consists of a large hollow sphere which is mounted on a specially designed platform that allows the sphere to rotate freely as the user walks in any direction. (Note that the open hatch in the picture above is closed during use.) The user wears a head-mounted display, which provides the virtual environment. Sensors under the sphere provide subject speed and direction to the computer running the simulation. Users can even ineract with objects in virtual space using a special manipulator.
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