Color is primarily Quality. Secondly, it is also Weight, for it has not only color value but also brilliance. Thirdly, it is Measure, for besides Qua… - Paul Klee

The evening is indescribable. And on the top of everything else a full moon came up. Louis urged me to paint it. I said: it will be an exercise at best. Naturally I am not up to this kind of nature. Still, I know a bit more than I did before. I know the disparity between my inadequate resources and nature. This is an internal affair to keep me busy for the next few years. It doesn't trouble me one bit. No use hurrying when you want so much. The evening is deep inside me forever. Many a blond, northern moon rise, like a muted reflection, will softly remind me, and remind me again and again. It will be my bride, my alter ego. An incentive to find myself. I myself am the moon-rise of the South.

The artist does not ascribe to the natural form of appearance the same convincing significance as the realists who are his critics. He does not feel so intimately bound to that reality, because he cannot see in the formal products of nature the essence of the creative process. He is more concerned with formative powers than with formal products.

What had already been done for music by the end of the eighteenth century has at last been begun for the pictorial arts. Mathematics and physics furnished the means in the form of rules to be followed and to be broken. In the beginning it is wholesome to be concerned with the functions and to disregard the finished form. Studies in algebra, in geometry, in mechanics characterize teaching directed towards the essential and the functional, in contrast to apparent. One learns to look behind the façade, to grasp the root of things. One learns to recognize the undercurrents, the antecedents of the visible. One learns to dig down, to uncover, to find the cause, to analyze.