"The electron, as it leaves the atom, crystallises out of Schrodinger's mist like a genie emerging from his bottle."

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Pauling was shocked by the freedom with which the X-ray crystallographers of the time, including particularly Astbury, played with the intimate chemical structure of their models. They seemed to think that if the atoms were arranged in the right order and about the right distance apart, that was all that mattered, that no further restrictions need to be put on them.

— John Desmond Bernal