Algodoo

Just your basic marble machine, I've used a couple different mechanisms for movement.

I especially like the movement of the top middle mechanic, where it has reduced the spin of the secondary wheel to 1/6th of the power wheel, but it isnt geared down and a simple 1/6th speed reduction, it moves fast then pauses, then moves fast then pauses... all mechanically with no scripting used. Elegant piece of rotating parts if you ask me