The Notebooks of Leonardo Da Vinci — Complete · Chapter 257Why Objects Which Are High Up and at a Distance Are Darker Than the Lower Ones, Even If the Mist Is Uniformly Dense

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Of objects standing in a mist or other dense atmosphere, whether from vapour or smoke or distance, those will be most visible which are the highest. And among objects of equal height that will be the darkest [strongest] which has for background the deepest mist. Thus the eye h looking at a b c, towers of equal height, one with another, sees c the top of the first tower at r, at two degrees of depth in the mist; and sees the height of the middle tower b through one single degree of mist. Therefore the top of the tower c appears stronger than the top of the tower b, &c.

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