Like most able men who have had to educate themselves the hard way, Charlemagne felt strongly the value of education, and in particular he saw the im… - Kenneth Clark

As for the Messiah, it is, like Michelangelo's Creation of Adam, one of those rare works that appeal immediately to everyone, and yet is indisputably a masterpiece of the highest order.

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.

For the student of visionary art the interesting fact is that an image comes first and takes up residence in the mind long before the artist has any notion why it is there or what it means. Whether visions come from some great reservoir of symbolic images which are eternally there (and if one examines the recurrence of images in history this proposition is not quite as crazy as it sounds) or whether they are due to buried memories, their obsessive power over an artist's mind, and their clear, compulsive emergence in his work depends on a mental condition that can come and go. When, for some reason, they no longer present themselves to the mind's eye, alive or clamoring to be born, the visionary artist has a hard time — dark days. This is particularly true if he has lost the habit of feeding his mind on the observation of nature.