The effect for the antichamber light on the door is probably not a projector at my guess.
Its probably a focused stage type light with a gobo pattern in a gobo rotator that is keyed to turn so far then stop.
Here is what a gobo is: http://en.wikipedia.org/wiki/Gobo_%28lighting%29
And an example of a gobo rotator: http://www.rosco.com/us/lightingequipment/dgr.asp
This way would be simply controled via a computer but the computer would just tell the power outlet to go on and off. The light would come on, then the gobo's socket. Gobo rotator off, light off. Gobo reset.
This would be the cheep way to do this and the simplest. PKI may of opted to use a 3-8 thousand dollar moving light controlled digitally by computer for this one task. The bulb can blow, the connection between the computer could go haywire, the computer could not work itself!