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[29] The figure pyramid has that name among geometers because it narrows into a cone after the manner of fire, which in our language is called πῦρ; for their size, as they mount to a vast height, gradually becomes slenderer, [p. 295] and also they cast no shadows at all, in accordance with a principle of mechanics. 1

1 This, of course, is true only when the sun stands directly over their tops.

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