it prevents over-concentration upon that face; it is the foil. Very different is the problem in Fig. 64 where lines have lost decision and the illusion sifts through the tone. Here the foil to the face is a shape of white linen speaking through the quality of color. Further decentralization is brought by the delicate accents of light in the background. Nothing in this picture is overcharged and it consequently holds our interest better than its predecessors.
Often the foil is more vigorous, as in Fig. 51, where the upright line of rock makes the face less personal and the attitude more dignified. A foil successfully used causes the workmanship to become less apparent. The tender spiritual quality of the foil cannot exist where there is no picture plan.