curlybot is an toy that can record and playback physical motion. As one plays with it, it remembers how it has been moved and can replay that movement with all the intricacies of the original gesture; every pause, acceleration, and even the shaking in the user's hand, is recorded. curlybot then repeats that gesture indefinitely creating beautiful and expressive patterns.
(Source: http://tangible.media.mit.edu/projects/curlybot/)