Simple but fun
[[VIDEOID:d3a790a29e8ee9b5eb1d68d97ce6e581]] A fun demonstration of an impossible concept, a perpetual motion machine.  I love it.  I turn it on during workouts or breaks to help me focus on something.  It's perfect for meditating as well.  It uses a rechargeable battery and magnets to simulate the impossible.
Rating: 5 stars