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white, nor pure blue with green or violett. The freer from all non-coloristic elements the pure color problem is carried out: the truer the suggestion of reality with all its air, light, greyness, detail, life all of which although having been excluded by the brush, comes into effect.
A [[underline]] picture must have its own key of illumination [[/underline]] instead of a relative (, weakened or heightened,) imitation of the light of reality; also its own resulting coloristic key of shadow, instead of that - uncoloristic - natural shadow.--
[[Image: Drawing at left]]
 1) On a day of the very purest air and strongest light the sky is of an inimitable blue, having green and purple in it, impossible to mix with pigments. The glare of the local colors of red, green, on surfaces opposite the sun is equally inimitable; the entire lit portion of a scene is brilliant; the distance at one thousand feet is visible in every leaf; at a mile is as near as the foreground as if depth of space were pressed flat and the distant planes projected or compressed upon the nearest plane and all shadows are nearly black. even 1000 feet away. 2.) On a day equally pure of air, but entirely cloudy, grey all local colors have their

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