A visitor to an exhibition like the Hockney one, if they were judging the quality of the art, might use a word like “beauty”. Now, if you use that kind of word in the art world, be very careful. There will be sucking of teeth and mournful shaking of heads because their hero, the artist Marcel Duchamp, of “urinal” fame, he said, “Aesthetic delectation is the danger to be avoided.” In the art world sometimes it can feel as if to judge something on its beauty, on its aesthetic merits, is as if you’re buying into something politically incorrect, into sexism, into racism, colonialism, class privilege. It almost feels it’s loaded, because where does our idea of beauty come from?