I have used the word zig-zag because I want you to feel how marked the contrasts are, and to realise that it is by means of these contrasts that an artist composes his figures. The zig-zag, however, in the actual figure has rounded angles; it is indeed rather a series of alternate curves to right and left, somewhat like the curves described by a skilful and graceful skater, cutting figures on the ice. And it is this series of curves that give the effect of rhythm as well as harmony to the figures in this picture. For, as you may have seen for yourself, the principles on which an artist composes a single figure are the same as those he uses in the composition of several figures into one picture. He relies upon repetitions and contrasts to produce a balance, which because of its rhythm of parts shall ensure a harmonious whole.