This guy, Clifford Stoll, build a robot to retrieve his Klein Bottles from the crawl space under his Oakland, California home. I was interested in the Robot (which uses Parallax parts) which I saw here.
Then (like you maybe), I asked, "What the heck is a Klein Bottle? That sent me to this video. Warning - This may make your brain hurt! This guy is way too smart. What an interesting character and idea! Great robot too!
Enjoy! Want one? Visit Acme Klein Bottles at http://www.kleinbottle.com/