 Isenberg concedes that we often appeal to descriptive features of works in support of our judgments of their value, and he allows that this may make it seem as if we must be appealing to principles in making those judgments. If in support of a favorable judgment of some painting a critic appeals to the wavelike contour formed by the figures clustered in its foreground, it may seem as if his judgment must involve tacit appeal to the principle that any painting having such a contour is so much the better. But Isenberg argues that this cannot be, since no one agrees to any such principle: