annoyance of trying to unify in his own mind the ill-adjusted factors on the screen.
The pleasing effect of motions in harmony can be illustrated by something with which we are all familiar from childhood, the display of sky rockets. The spray of stars, flaming up, burning bright lines in the sky, and fading out again into the darkness of night, exhibits a perfect harmony of kinds, directions, and rates of motions, as well as of changes in brightness. We have explained in Chapter III that things moving in similar directions are more pleasing than those crossing in opposite directions because they are easier for the eye to follow. And it is, of course, true that whatever hurts the eyes will probably not seem beautiful. But a picture must please our emotions as well as our eyes. We must feel that it is good, that it is in order, that it obeys some law of harmony. In the case of the sky rocket we do feel that there is unity and not discord, rest and not warfare. Though we may not stop to analyze the matter, we feel that at any one moment all of the burning elements are in perfect agreement, obeying the same law of motion.
Now let us recall some familiar movie subjects, and test them for harmony. A common picture is that of a horse and an automobile racing side by side. Here there is similarity of direction, but there is no similarity of motion. The car glides; the horse bounds. The changing pattern which the horse describes with legs and neck and back and tail finds no parallel in the moving panel of the car. Besides, we feel that there is antagonism between the two. They hate each other. Their histories and destinies are different. They are not in harmony. A much better
