The Perpendum (also known as the Swinging Sticks) is an awesome hypnotic desk toy that is set to give your office desk a modern art edge. It recently shot to fame in the Iron Man 2 movie and now you too can own this amazing kinetic sculpture.
Its two arms constantly rotate, never giving the same positions twice (apparently) simulating perpetual motion. Since perpetual motion would violate either the first or second law of thermodynamics (obviously) there must be a trick to these spinning arms? And there is, it is powered by 4 x AA batteries which will power it for an unbelievable 3 years!