Like marks on the surface of a beautiful painting, once you are aware of the imperfections, it is hard to re-enter the illusion of the image.

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Attempting to achieve the enamel-like surface of early Renaissance panel painting, they painted on smooth panels or on fine-woven canvas rigidly stretched.

WSJ: Victorian Avant-Garde | Pre-Raphaelites: Victorian Art and Design | National Gallery of Art | By Barrymore Laurence Scherer