Rube Goldberg's Spawns!

Why is watching something do lots of stuff for no reason other than to keep moving so entertaining? Is there a section of the brain that loves useless complexity?  Was it really Rube Goldberg that really got this glorious contraption ball rolling.

We've sniffed out a bowlful of such wonderfully organized chaos to place in The Bowl today.
It's hard to find a well shot video of the Goldbergian devices that call themselves art.  But this one qualifies:

George Rhoads seems to be the most recognized complicated-marble-run-as-art maker out there but unfortunately I have not been able to locate any quality videos of his machines in action.  You can see a lot of what he's made right here though.