The Cavern is a fully-immersive environment which surrounds the user in 3-D space via four rear-projected screens, which are interactive with special polarized glasses worn by the user.

The projection system optics are manufactured by Bell & Howell, and provide an apparent 0.8 X 0.96 -inch pixel size at our special experimental 120 X 100 FGA resolution when projected on the Cavern's 8-foot screens.

The slight screen separation enhances queasiness, an important factor in all FAIT development efforts.

We developed this style of immersion long before the University of Illinois people ever thought of it - it was often used as a visual feedback environment for our Baseball Bat Haptic Feedback chair.