Boyd...That's exactly what I was thinking. If you put weight on your bridge hand (like you're supposed to), wouldn't the tabletop move? I was "invited" a couple of times to PAY for the privilege of teaching on this ship (I was offered a cheap 'way below decks' room, as compensation, though)! I declined...
I wondered about that, too. You could steer a rolling ball by pushing the corners down. Might make an interesting game, but it wouldn't be pool.
Cool idea though.