This “Hamster Wheel” robot is truly unique! The motors, gearing, and robot brain all stay stationary in the middle, while a wheel (made out of inverted tank treads) around the edge rolls the robot along. Kickstands on the side steer the robot - lower the right side to turn right, and vice versa.
http://content.vexrobotics.com/vexiq/images/demobots/VEX_IQ-hamsterwheel-950px.jpg
