“Many of the assumptions of the world a century ago have been so overturned that you would think the paintings Pablo Picasso and Georges Braque, produced between 1907 and the first world war, would make perfect sense today, and even appear a little naive. Yet their difficulty is not of a type that recedes with familiarity. Cubism is like a maths exam at the gateway to modern art. The paintings are uniquely unyielding… Art today is made from the building blocks of ordinary life. Cubism took these building blocks, or working premises, apart. Most art confirms our sense of who we are and how we live. Cubism suggests that our real existence eludes the images and stories we constantly make of it.”