Leonardo, da Vinci, 1452-1519, Rigaud, J. F. (John Francis), 1742-1810, Brown, John William · London : J.B. Nichols and Son ... · leaf 273
nd darker as weU as bluer in looking upto the sky; because there is more of the thick airbetween our eyes and the horizon, than betweenour eyes and that part of the sky above our heads. • These propositions, any more than the others mentioned indifferent parts of this work, were never digested into… … For instance : if the eye placed in P, looksthrough the air along the line P R, and then lowersitself a little along P S, the air will begin to ap-pear a little whiter, because there is more of thethick air in this space than in the first. And if itbe still removed lower, so as to look straight…
Leonardo, da Vinci, 1452-1519 · Painting · Drawing · Perspective
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