Ambitious and improbable gears: video

Back in September, I blogged Quilty1987's mesmerizing YouTube tutorial on making weird, erratically shaped gears that really mesh and spin. At the time, I pondered what these would look like if they were part of a larger, more ambitious project. Now I know: here's another Quilty1987 (AKA Clayton Boyer) video of several geared creations that do improbable and wonderful tricks with teeth and spins.

These Gears Really Work? (via JWZ)