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The good answer is to create some kind of perpetual motion machine.
The cool answer is to create some kind of roller coaster that just keeps going and going
The fun answer is to create some chaos. Put one behind a door or something and the other in some unexpected place.
Oh, see I was thinking a portal on the ISS, but absolutely you could place one against the other, plop in a MASSIVE pole with teeth to match a gear, and just constantly generate power.