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Once I have the picture of coins in my head I cannot rid myself of the coin midway ( on it's edge) ( a third state )in my minds eye. I then have to rid myself of this by trying to imagine a coin of infinite thinness. In a cashless universe what will physicists of the future use? Is there anything better than coins to demonstrate such concepts., or am I stuck with one always on edge? The author of the article doesn't seem to comprehend the concepts involved either, but he does enjoy trying ;)