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There is no first principle which is in itself unknowable, not to be captured by a flash of insight. But, putting aside the difficulties of language, deficiency in imaginative penetration forbids progress in any form other than that of an asymptotic approach to a scheme of principles, only definable in terms of the ideal which they should satisfy.

Alfred North Whitehead, Process and Reality

Leon Mandel Guatemala Expedition. 1933-1934 (Reel 2). Field Museum of Natural History.

In orbit. The Earth In Motion. 1936.