The projectors and the mirrors (if there are any) for the walls may be located in front of or behind the screen depending upon the type of system. The projector for a floor is usually suspended from the ceiling of the structure (although six-sided cubes will have the floor rear projected from the bottom). The projectors and mirrors are very sensitive to any motion. It takes at least an hour to align and calibrate each projector and mirror to match at the corners of a CAVE. Please be careful not to move the projectors or mirrors if you have to walk in that area.
Never turn off the projectors unless instructed to do so. Turning the power off can affect a projector's alignment. On most projectors you should use the standby button on the remote control to activate/deactivate them. Press and hold the standby button on the remote control for a couple of seconds. Do not touch any other control that might cause the projectors to go out of alignment.
Once you are done using the CAVE, remember to put all the projectors back in standby mode. The projector tubes have a limited life span that can be extended by putting them on standby when not in use.