Roombas may seem like happy little domestic appliances, wobbling around your apartment cleaning up after you. But they're secretly hatching desires to become the next great robo-artist. Just look at this time-elapse photo.

The picture above shows an 11-minute exposure of a Roomba cleaning a room with an LED on its back. The LEDwas fading from blue to red, thus producing the cool purpley silly string effect, which wouldn't be out of place in a 1980s Prince video. Here's another one from the same artist, Reconscious:

They're both part of the Roomba Art Pool on Flickr, which includes a ton of other amazing light-up patterns. Check it out!