Magnetic balls, a mirror and a few LEDs
Here's a neat video which combines fairly ordinary things in an unexpected way.
In this video, a guy takes a couple of magnetic balls, probably like the ones used in the children's toys, and spins them rapidly on a mirror. Once they are at a high RPM, he uses LED microlights to create neat effects ranging from slowing spinning rings of light to rapid spirograph type patterns. Pretty cool!
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