Because it is an ordinary object elevated to the dignity of a work of art by the mere choice of an artist. It’s what readymades are all about. Granted, there’s also craft involved, e.g. Duchamp is said to have browsed through quite a couple of bicycle wheels to find one that was appropriately banal for his intentions, but that, as far as we know, wasn’t the case with Fountain (said urinal on a pedestal). He just had a point to make about the nature of art and bought the next best urinal, put it on a pedestal, and signed it with a random pseudonym to not have people fawn over his signature.

That was art. Since then, tons of self-professed conceptual artists have produced nothing of value, producing slop, repeating the same point ad nauseam, worse, thinking that the point was to be crass and vulgar. Banksy pointed that out quite brilliantly when he used the medium of art auctions to paint a picture of rich nitwits jerking off to being given the finger.

Prefer your pristine statues of roman soldiers, do you?

Check your bite reflexes. That’s not to say that the Romans didn’t know a thing or fifty about sculpture but I know exactly what you’re trying to imply.

AI can’t communicate.

And neither can a porcelain factory.