Consider a train with railroad tracks on its roof. One can run another such train on those tracks, and so forth, eventually exceeding the speed of light. It's a fallacy because time slows down the higher up the stack you go, affecting relative velocity.
Nevertheless, the challenge is to build such a contraption, probably at model-size. Because we have limited space, we first lay down a circular track and place a circular "train" of exactly the same circumference on it and then continue stacking.
At higher levels, centrifugal force might become a problem. We construct a tall center post, and anchor each train via spokes to it. Each train is more like a horizontal bicycle wheel. The post and spokes might also be useful for power distribution, or one could use electrified rails from train to train.
The result is a rotating cylinder whose top rotates much faster than the bottom. Put mirrors on the side and replicate Michelson's speed of light experiment. Put a cap on the top and it's a turntable.
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