The Vikings were quartering the world; they set out from a base, and with unbelievable courage and ingenuity, they reached as far as Persia by the Vo… - Kenneth Clark

At some time in the ninth century one could have looked down the Seine and seen the prow of a Viking ship coming up the river. Looked at today in the British Museum it is a powerful work of art; but to the mother of a family trying to settle down in her little hut, it would have seemed less agreeable – as menacing to her civilisation as the periscope of a nuclear submarine.

Two pictures painted in the year 1907 can conveniently be taken as the starting point of twentieth-century art. They are Matisse's Blue Nude and Picasso's Demoiselles d'Avignon; and both these cardinal, revolutionary pictures represent the nude. The reason is that the revolt of twentieth-century painters was not against academicism: that had been achieved by the impressionists. It was a revolt against the doctrine, with which the impressionists implicitly agreed, that the painter should be no more than a sensitive and well-informed camera. And the very elements of symbolism and abstraction that made the nude an unsuitable subject for the impressionists commended it to their successors. When art was once more concerned with concepts rather than sensations, the nude was the first concept that came to mind.

People sometimes tell me that they prefer barbarism to civilisation. I doubt if they have given it a long enough trial. Like the people of Alexandria, they are bored by civilisation; but all the evidence suggests that the boredom of barbarism is infinitely greater.