The KHRONOS PROJECTOR interactive-art installation
The Khronos Projector is an interactive-art installation allowing people to explore pre-recorded movie content in an entirely new way. 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. By actually touching a deformable projection screen, shaking it or curling it, separate "islands of time" as well as "temporal waves" are created within the visible frame. This is done by interactively reshaping a two-dimensional spatio-temporal surface that "cuts" the spatio-temporal volume of data generated by a movie.
Check out the movies they have demonstrating this technology. It doesn't really start to make sense until you watch it in motion.
Link (via BoingBoing)