Noah Scalin sent me a link last night to this incredible set of mechanical mini-sculptures by Bradley N. Litwin called MechaniCards™. So cool! Definitely go over and check out the video. There's some ingenious stuff going on here. This from his site:
"MechaniCards™ are miniature, hand-operated, kinetic sculptures, designed and produced in limited edition by Bradley N. Litwin. Each one is hand made, numbered and signed by the artist. They are constructed primarily from paperboard, with a few bits of wood, metal, or plastic. They make excellent gifts, and are suitable for mailing, as truly unique greeting cards. Each piece comes with complete instructions and display recommendations. They are also available as do-it-yourself construction kits."
You can check them all out here.