Critter and Guitari are hardware hackers, artists, and musicians from Philadelphia, PA. Like some other similar folks (Karl Klomp and Dewanatron come to mind) they have begun offering some of their custom creations for sale.

Of interest to me are the visual tools they have created, including the Television Oscilloscope and Cellular Automata Video Synthesizer Kit.

I’m inclined to think of these as toys or works of art rather than serious visualization tools, but whatever you call them they certainly are cool.