Just like magic - incredible new project from Sweatshoppe in which video is "painted" onto a wall. Video demonstration below, (don't miss it! absolutely visually amazing).
Process works as follows (Design Boom):
"Sweatshoppe...uses video mapping techniques as a means of video painting onto walls through the use of a paint roller. The only catch is, the paint roller doesn't actually paint anything onto the wall. Instead it is made from green LEDs which work in conjunction with a camera next to a projector which is programmed with software that tracks its movements. The software then outputs the X-Y position of the roller projecting a textured video image of the strokes the duo are drawing on a wall."