Awesome: The Perpetual Domino Machine
The Ouroborus Domino Machine was created by Karl Lautman and knocks over and picks up dominoes all by itself -- with magic! It's really therapeutic to see. Like watching two children beat each other in the head with plastic bats. But with less cheering and betting.
Ouroborus Domino sculpture rebuilds itself [slipperybrick]
Thanks to Melissa, who had one of those little Domino Rally cars that set up the blocks for you. That's called cheating, Melissa. Not as bad as this, but close.