"The dream is not a map. A poem is not the territory. The dreamer reclines in a barbershop carpeted with Afro turf. In the dark some soul yells. It hurts to walk barefoot on cowrie shells."

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There is a theorem that colloquially translates, You cannot comb the hair on a bowling ball. ... Clearly, none of these mathematicians had Afros, because to comb an Afro is to pick it straight away from the scalp. If bowling balls had Afros, then yes, they could be combed without violation of mathematical theorems.

— Neil deGrasse Tyson