A Coin (n.) is money that speaks a national language and wears a national uniform.
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A Coin (n.) that circulates weighs ten times what it weighs: like a general who appears at ten points of the battlefield, it does the work of ten.
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A Coin (n.) keeps mixed company and is used up by being used, until its body becomes a shadow of its name.
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A Coin (n.) is the one thing idealized by contact with the world: other beings lose their idealism out there, the coin wears down into a phantom of its golden body.
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A Coin (n.) did not keep circulating because it was worn; it wore down to a symbol because it kept circulating.