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

that's reasonable.

bonus fun fact - the etymology is connected - "axle" comes from older words for "shoulder", or "armpit", which survives in some regional Englishes as "oxter" - the connection is apparently that you'd carry a person by putting their arms up and linking at the shoulders, much like an axle is how wheels carry a cart.

https://www.etymonline.com/word/axle

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