I saw this a while ago, but didn't blog it.
I don't know why, because this is SO COOL. The Khronos Projector is basically a way of manipulating video in the 4th dimension.

The Khronos Projector is an interactive-art installation allowing people to explore pre-recorded movie content in an entirely new way. A classic video-tape allows a simple control of the reproducing process (stop, backward, forward, and elementary control on the reproduction speed). Modern digital players add little more than the possibility to perform random temporal jumps between image frames. The goal of the Khronos Projector is to go beyond these forms of exclusive temporal control, by giving the user an entirely new dimension to play with: by touching the projection screen, the user is able to send parts of the image forward or backwards in time.

Simply put, you fast forward or rewind different parts of the video in different places, allowing one corner to be at the end of the clip, while the rest is still showing the first frame. There's some stuff about a time cube as well, but it's not what you think. Watch the video--it explains all.  ¶ 10:35 p.m.