The iCube is described as being:
“comprised of three white walls and a floor, all about 10′ x 10′ in size. Onto each surface is projected a high-resolution, stereoscopic image. A viewer stands in the room wearing polarized 3D glasses — like you might use in a 3D movie — with small markers that stick out a bit from the frames.
The markers are illuminated by IR LED floodlights located on the perimeter of the room, and IR-sensitive cameras use those positions to determine the precise location of each eye within the room. From those positions, stereo images for each projector are calculated and rendered on the fly, and the result is absolutely amazing.”
A video demo can be found below but I highly recommend you watch the HD version here.