The artist Chris Burden might be better known for putting his body through hell than for building complex interconnected systems, but his mechanical sculpture work has quite a history. His new work, Metropolis II, is an elaborate interconnected system of tracks for some 1,200 Hot Wheels cars. The noise is impressive.
[youtube]https://www.youtube.com/watch?v=_UQ2vqFJvpA
If you're in Los Angeles, you'll be able to see Metropolis II at LACMA, though it apparently takes a few months to install it.
Via Kottke