Physical Computing Lab2D- Button Spinners from Noah King on Vimeo.

This concept here is to have three separate towers/motors/spinners, each one with a Red/Yellow/Blue colored wing.  By pressing different button combinations, colors optically mix and basic color theory is visualized.  This video is of a test.  Once I get a third motor and I construct some wind blades, I’ll finish up this idea.

This concept could easily be developed into a wire-controlled car, using three buttons as switches for FORWARD (both wheels spin), LEFT (only right wheel spins), and RIGHT (only left wheel spins).  Considering that the range of the car would be limited to the length of the wires, it would make some sense to use four motors, two front-facing, two rear facing (or to figure out some way to get the motor to reverse polarity through a switch) so that the car could go backwards and forwards.

Link for source code.