When I was a kid I used to make walking Lego models using Lego pneumatic elements and pneumatic logic to synchronize movement. My experiments eventually culmina

When I was a kid I used to make walking Lego models using Lego pneumatic elements and pneumatic logic to synchronize movement. My experiments eventually culminated in a (extremely slow) Rubik's cube manipulator which used a couple of first generation Mindstorm RCXs to "solve" the cube by reversing the shuffling stage.