An artist who sees that the imitation of natural appearances, however artistic, is not for him – the kind of creative artist who wants to, and has to express his own inner world – sees with envy how naturally and easily such goals can be attained in music, the least material of the arts today. Understandably, he may turn toward it and try to find the same means in his own art. Hence the current search for rhythm in painting, for mathematical abstract construction.... the way colors are set in motion, etc.