About money, Andy Warhol was nobody’s fool. He was, of course, the first artist to explore art explicitly as a business, which is to say, business as an art. He was as quick to encourage others to bring home the bacon (he told Lou Reed to write more songs—“It’s work, the most important thing is work”) as he was to do so himself: portraits were rarely done for free, and one reason Warhol started modeling was to ensure that he would be paid even for his appearance. And yet it is still surprising to see how beautiful Warhol’s late paintings of the dollar sign are. Sinuous, hypnotic, pulsing in hues