if its for quantum physics demonstrations, you could have perpetual motion machines, probably. at least until it heats up and dies, like everything else 😉
Engenius Perpetual Motion Marble Run - Gift Discoveries
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if its for quantum physics demonstrations, you could have perpetual motion machines, probably. at least until it heats up and dies, like everything else 😉
like this idea. some sort of logic gate run for small balls.