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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[–] 3 points 2 months ago (2 children)

No, that's what I meant by not an axle.

But, come to think of it, we can swing our arms round and round, more than 360°.

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  • [–] 1 point 2 months ago (1 child)

    I would argue that's more due to the up-down and front-back limited rotations combining to form a circular mode, kinda like a Cartesian to Polar coordinate mapping

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