What do you get when you add Kinect to a Pufferfish spherical display (yes, that giant orb you see above)? Behold the creepy eye that follows you everywhere:
The orb-shaped display has a big iris and retina on it and makes the rough display look like a giant eyeball sitting there on the podium. The Kinect sees when a person walks up and the eye pops up on the sphere and then follows the person as they walk around the room.
Technabob has the video clip: Link