As most coins have: how the coins is circular is obvious, how they are rdctangulare are somewhat harder to see, but look from the side !
And the square circular coin would be as obvious as the circular coin currently is.
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No. Most people are well aware that a circle is an abstract entity.
OK. When somebody says "I just drew a circle" what is it that you think they're saying? I think they're saying that they just drew a circle. You apparently come to a different conclusion and I'm curious what that is.