"The device does not gather "free energy" as is sometimes advertised. It does convert potential energy in the form of the steel ball's distance from the magnetic source to kinetic energy as it rolls towards it - just as is done by any object when it falls. Similar forces are at work in the swinging of a pendulum, but the representation is created by the perceived increase in gravitational potential energy as the ball rolls up the ramp. The eye is not attuned to see the decrease in magnetic potential energy as it moves towards the magnet."