Nature creates round objects all the time (stones in a river, a hedgehog in a ball,...), but the principle of an axle is not found as far as I know.

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[–] [S] 10 points 2 months ago*

If your knee can turn 360°, you should talk to some scientists, so that they can study you.

Rotating is in nature, but as you said: always with a maximum rotation, never free without limits.

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