Some years ago at the Louvre, one could see quite a few visitors hurriedly walking past walls of Italian Renaissance art, any hundred square feet of which walls

Some years ago at the Louvre, one could see quite a few visitors hurriedly walking past walls of Italian Renaissance art, any hundred square feet of which walls would be the making of a small American city's museum, to stand at ten yards from the Mona Lisa and take a picture. I suppose that some number of them, having checked that off, went on to look around and see what else the Louvre had.