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What’s unusual about these dice is obvious. But what’s normal about them?
When thrown together, they produce the same probability distribution as a pair of ordinary dice. There are six ways to throw a 7, five ways to throw an 8, etc. This the only possible alternate arrangement in which all the face values are positive.
They were discovered/invented by George Sicherman of Buffalo, N.Y. See also Nontransitive Dice.