The artist hangs his brains upon the wall and there they remain without explanation or defense. The crowd as it passes, enjoys or jeers, as the ideas of this mute language are comprehended or confounded. Art requires no apology and asks none; all she requests is that those who would affect her must know the principles upon which she works. An age of altruism should be able to insure to the artist sufficient culture in his audience so that his language be understood and that his speech be not reckoned as an uncertain sound. The public should form with him an industrial partnership, not in the limited sense of giving and taking, but of something founded on comprehensibility.
--- from H.R. Poore's Pictorial Composition And The Critical Judgment of Pictures
(Louvre photo from tumblr source)