Check out this amazingly cool video from Bruno Levy and Blake Shaw ( aka Sweatshoppe ) who have invented a with a way to “paint with video”. There is no actual paint involved, instead the rollers have LEDs which are motion tracked by a projector which creates the effect shown in the video. This is a such a cool concept, I can only imagine the innovative directions it could go in with further messing about.
Sweatshoppe developed the software that drives the idea themselves and are gonna be releasing it to the public as they work out some of the bugs!! Sweeeeeeet.
Also check out this lazer tagging it's pretty cool too.