I would say that the 'blue print' is found in the valar. In the Annals of Aman, it is stated that "after the coming of the Eldar they (the valar) most often used shapes of 'human' form, though taller (not gigantic) and more magnificent". In letter #246, Tolkien states about Sauron: "the form that he took was that of a man of more than human stature, but not gigantic".
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