An extremely common project for a control systems class is the inverted pendulum. Basically, it’s a robot mounted on a linear rail, a hinge, and a pendulum sticking straight up in the air. Ge… ...

The BallP, short for Ball inverted Pendulum, balances on top of a ball. ... If it was just 3 balls mounted to a frame (and presumably some form of arduino) it wouldn’t be as impressive.