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The effect which remains temporarily upon the retina of the human eye after regarding any specific colour, to which I have alluded, is a considerable importance to the painter in arranging the juxtaposition of his colours in any process of decoration, because if the eye turns from, say, a plaster of a certain colour to a panel of another, the effect of the first colour which remains on the eye may materially affect the second. Thus, if the eye has been gazing upon yellow, it will see orange as reddish orange, red as reddish violet, violet as bluish violet, blue as violet blue, and green as bluish green.