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Perspective Without Pain by Phil Metzger

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Color and Value Change

Take a look through your window. If you can see very far– say, a mile or more– you'll notice that distant objects appear much less colorful than they actually are. A distant skyscraper might look gray even though it's made of pink granite or green-tinted glass. Far-off hills or mountains look bluish or purplish, depending on how far away they are and what sort of weather you're having, yet you know they would not appear blue or purple if you were actually there, climbing them.

The reason the colors of objects seem different from a distance is that there is a sort of veil you're looking through to see them, and the farther away you are, the thicker the veil. The veil, of course, is the layer of air between you and the object. ...

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