The Finkbuilt drawbot

The overtalented Steve Lodefink made a drawing robot for his kids out of a paper cup, a toy motor, a battery, felt pens, and duct tape. The video of the drawbot in action is a joy to behold.

The concept is almost ridiculously simple; I'd like to see an industrial-scale version set loose in a major city with an arsenal of giant airbrushes and chalk-dusters!