The bottom pad goes on the ground. The player stands on the swivel base. It’s a ball joint, so the player has to lean his/her entire body to tilt the pad. The ball joint registers the orientation of the player both leaning of the pad and twist. The ball joint doubles as a pressure sensor, so it can tell when the player jumps off of it. This is the only truly revolutionary controller design. Think about it. You want the character to walk forward? Just lean forward. You want the character to jump? Just jump. You want the character to circle strafe while firing in the upper left quadrant of your screen? Well, too bad!