It may help you, as it has helped me, to understand the combination of these numberless repetitions and contrasts of color, if I tell you of an experience of sound that I remember. I was one of a party walking in the Swiss mountains, and at a turn in the path we came upon a man, sitting with a gun across his knees. For a small amount this mountaineer was prepared to let off his gun. We paid, he fired. There was a sharp report--a focal point of sound--then a neighboring mountain side sent back an echo, which was caught by another that sent it back, whence again it was re-echoed from another mountain peak, and so on, back and forth, until in a moment or two, the whole mountain world resounded with a wondrous roar. From a single note of sound, which made a very slight impression had grown a multiplication of slightly differing sounds. For the first echo was slightly different to the original note, and then again the echo of this echo differed slightly, so too the echo that came next and the one that followed that, and so on through a scale of slightly varying tones, that finally merged into one huge swell of throbbing sound, as of some mighty organ music--a harmony of tumult. It was a wonderful sensation, and has helped me to realise the wonder of color harmony. For an artist generally founds his color scheme upon one or two notes of color, and then by representing the echoes of these colors, as they are reflected at different angles from the various planes of surface, gradually elaborates or works out a maze of related colors that merge into a harmony.