We shall now understand the comic element in caricature. However regular we may imagine a face to be, however harmonious its lines and supple its movements, their adjustment is never altogether perfect: there will always be discoverable the signs of some impending bias, the vague suggestion of a possible grimace, in short some favourite distortion towards which nature seems to be particularly inclined. The art of the caricaturist consists in detecting this, at times, imperceptible tendency, and in rendering it visible to all eyes by magnifying it. He makes his models grimace, as they would do themselves if they went to the end of their tether. Beneath the skin-deep harmony of form, he divines the deep-seated recalcitrance of matter. He realises disproportions and deformations which must have existed in nature as mere inclinations, but which have not succeeded in coming to a head, being held in check by a higher force. His art, which has a touch of the diabolical, raises up the demon who had been overthrown by the angel. Certainly, it is an art that exaggerates, and yet the definition would be very far from complete were exaggeration alone alleged to be its aim and object, for there exist caricatures that are more lifelike than portraits, caricatures in which the exaggeration is scarcely noticeable, whilst, inversely, it is quite possible to exaggerate to excess without obtaining a real caricature. For exaggeration to be comic, it must not appear as an aim, but rather as a means that the artist is using in order to make manifest to our eyes the distortions which he sees in embryo. It is this process of distortion that is of moment and interest. And that is precisely why we shall look for it even in those elements of the face that are incapable of movement, in the curve of a nose or the shape of an ear. For, in our eyes, form is always the outline of a movement. The caricaturist who alters the size of a nose, but respects its ground plan, lengthening it, for instance, in the very direction in which it was being lengthened by nature, is really making the nose indulge in a grin. Henceforth we shall always look upon the original as having determined to lengthen itself and start grinning. In this sense, one might say that Nature herself often meets with the successes of a caricaturist. In the movement through which she has slit that mouth, curtailed that chin and bulged out that cheek, she would appear to have succeeded in completing the intended grimace, thus outwitting the restraining supervision of a more reasonable force. In that case, the face we laugh at is, so to speak, its own caricature.