Museums are now so crowded it’s impossible to really see art. “The more I watch viewers thronging to sample the latest blockbuster shows, or the permanent collections at the Prado, the Louvre and the National Gallery, the less convinced I am that they are giving art any sustained attention. Most visitors move through exhibitions and museums with disconcerting speed. Pausing now and again in front of particular images before resuming the onward march, they do not seem prepared to scrutinise anything for a substantial length of time.”