The pictorial work of art bears witness, above all else, to the process of creation. Whatever it is that differentiates a work of art from mere skilled productivity—(and aesthetic theories rage about this issue)—it would appear that only in the case of the former is the spectator made conscious of that heightened scale of perception, at once purposive, integrated, and whole, which is the distinguishing feature of creative activity. And if we admit the principle of creativity in artistic expression, then we must seek in paintings something more than a reproduction of external appearance. The visible world indeed is the raw material of art, but it is moulded and fashioned by the artist according to his own purposes and, it is now suggested, by certain qualities of reminiscence. As a consequence of the relation which exists between his own emotional life and these qualities he creates in pictures a world of reality which has for him a compelling intensity—an irradiance in which he finds meaning and justification for his work. It is the embodiment of some new state of comprehension, bringing order, coherence and purpose to what otherwise would be formless and lacking in meaning. This world re-born, founded in experience, is invested with conviction and validity. The making of such an extra-sensory world is at the heart of creativity, for only so can the artist create the conditions for a communicable experience. A purely private world is mysterious and incommunicable, and does not provide the conditions in which schools of art can develop.