I saw this weird little micro robot at, of all places, Radio Shack, priced at $12.95. Looked interesting so I said "What the hell - a little robot for $13 - I'll take one". I'm always on the lookout for ways to add actual movement to my wood turnings.
(HexBug's CRAB micro robot - shown about actual size)
When I got home I discovered that this thing has TWO, count 'em TWO sensors on it. One detects the presence or abscence of light, and one "listens" for a loud noise, like a hand clap, and "feels" for vibration - like a tap on its "head" - or on the floor or table near it. Any of those things will either set it off waddling along, crablike, or, if it's already waddling along, cause it to stop.
Then EUREKA! ideas started popping into my head - the resulting pieces and development follow.
More To Come (three more ideas using HexBug's CRAB are in development)