"The great thing about the sixties was the dawning recognition that anything could be a work of art, which was something evident in all the main movements of the time—in Pop art, Minimalism, Fluxus, Conceptual art, and so on. What accounted for the difference? The big mantra in the art world was Frank Stella’s sullen “What you see is what you see.” But there was not a lot of difference between what you see when you see a Brillo Box by Warhol and the Brillo boxes designed by James Harvey for the Brillo people to use for moving their products about. So: why weren’t they artworks if Andy’s Factory-produced boxes were? I have answered this in my first chapter, so what I want to do now instead is to marvel at the way in which the camera helped give form to the philosophical question that had been kicking around for a few millennia, “What is art?,” and to explain why the photography-painting paragone had to be the last paragone. By the time Duchamp and Warhol had left the scene, everything in the concept of art had been changed. We had entered the second phase in the history of art, broadly considered."