The beauty of gradation

What curvature is to lines, gradation is to shades and colors. It is there infinity, and divides them into an infinite number of degrees.Absolutely, without gradation no natural surface can possibly be, except under circumstances of so rare conjunction as to amount to a lusus naturæ; for we have seen that few surfaces are without curvature, and every curved surface must be gradated by the nature of light, which is most intense when it impinges at the highest angle, and for the gradation of the few plane surfaces that exist, means are provided in local color, aerial perspective, reflected lights, etc., from which it is but barely conceivable that they should ever escape. Hence for instances of the complete absence of gradation we must look to man's work, or to his disease and decrepitude. Compare the gradated colors of the rainbow with the stripes of a target, and the gradual concentration of the youthful blood in the cheek with an abrupt patch of rouge, or with the sharply drawn veining of old age. art oil painting