Video: The infinite number of ways you can build a complicated Rube Goldberg machine makes it infinitely fascinating to watch them run. Even when they're built from tiny watch parts like this Seiko creation, and are so small they can easily squeeze onto a table, instead of filling a massive warehouse.
It's a little disappointing that occasionally there's some human intervention required to keep this Rube Goldberg contraption running. But it's understandable when some of the 1200 mechanical watch parts used are smaller than a millimetre in size. At that scale, even gravity needs a helping hand.