The user enters a 10 foot by 10 foot by 10 foot room (or even 20ft by 20ft by 20ft in NASA) where images are projected onto the three of the walls and the floor. When the user dons a pair of lightweight StereoView LCD shutter glasses, the projected images fill the room and surround the user.
The user can move around the room reasonably unencumbered, and can walk around or through the virtual objects in the CAVE. Since they can see their own bodies, users have a true sense of being inside the virtual environment. The user carries a physical three button wand to interact with the virtual objects in the CAVE.