Here is a simple magnetic toy that puts on a trippy show as you spin it. This Black Magnetron has rotors with 3 magnet arms. As you spin one or both, they interact with each other, with the momentum bouncing back and forth between the two rotors.
More gadgets like this: here
Black Magnetron Magnetic Desk Toy ►► Gadgetify
Andrews Magnetron Magnetic Fascination (US Patent #5135425) is rare, but you can always find it on eBay.
[HT]
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