To understand "why modern art is hard to get"
Walk the "less and less like" line: the Renaissance painted lifelike, Impressionism began painting light and the feeling of the instant, Cézanne asked after the geometry of objects, Picasso simply broke it apart and reassembled it, and Duchamp sent a urinal to an exhibition — and you find that modern art is not "unable to paint," but that the question it wanted to ask had long shifted from "does it look real" to "what even counts as art."