Only the bad artists of the nineteenth century were frightened by the invention of photography; the good ones all welcomed it and used it. Degas like… - Kenneth Clark

To anyone who is not an artist it must seem rather strange that Degas who could do anything — for whom setting down what he saw presented no difficulties at all — should have continued to draw the same poses year after year — often, it would seem, with increasing difficulty. Just as a classical dancer repeats the same movements again and again, in order to achieve a greater perfection of line and balance, so Degas repeats the same motifs, it was one of the things that gave him so much sympathy with dancers. He was continually struggling to achieve an idea of perfect form, but this did not prevent him looking for the truth in what might seem an artificial situation.

It means that at certain epochs man has felt conscious of something about himself – body and spirit – which was outside the day-to-day struggle for existence and the night-to-night struggle with fear; and he has felt the need to develop these qualities of thought and feeling so that they might approach as nearly as possible to an ideal of perfection – reason, justice, physical beauty, all of them in equilibrium. He has managed to satisfy this need in various ways – through myths, through dance and song, through systems of philosophy and through the order that he has imposed on the visible world. The children of his imagination are also the expressions of an ideal.

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.