In my opinion, the coolest thing was Music from a Failed Economy, which was made up of 5 different organs that played themselves. You flip the on switch and a series of turning pieces of wood hit the keys at the right times. It's pretty great.I was hoping that I'd be able to find a video online, but there are 0 search results for "Music for a Failed Economy" so you'll have to put up with the horrible audio quality of my phone to get a small idea of what it was like. It doesn't sound so discordant in person.
Next time I just gotta bring the actual video camera.