While perpetual motion is not real scientifically, plenty of companies have made toys that create an illusion of it by using magnets and other clever mechanisms. Take these 2 electromagnetic marble machines. They keep tiny steel balls going without you having to do a whole lot. Both models have a transparent design, so you can see the internal components through their shell.
More gadgets like this: here
2 Transparent Automatic Marble Machines Compared ✌️ @Gadgetify
One of these keep launching a tiny ball to the top platform. The other is a spiral marble machine that keeps going. Both of them have a convenient touch button and a light in the back that turns on to let you know the machines are ready to go. These are not only great desk toys but can be used to teach science to kids in a fun fashion.
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