I've been a machinist for a long time, and the effort that went into this is astounding. Relatively simple idea, but to assemble all this stuff out of raw material is really amazing and cool. I'm wondering how many tiny chairs or cats they went through before balancing that thing right.
this thing in various forms was on display in a glass case by the entrance to the MIT museum for years. I would walk by and watch it at least four times a week and still haven't gotten sick of it.