From this point of view the justification of the metaphor of mechanical balance is quite clear. Given two lines, the most pleasing arrangement makes the larger nearer the centre, and the smaller far from it. This is balanced because the spontaneous impulse of attention to the near, large line equals in amount the involuntary expenditure to apprehend the small, farther one. We may thus think of a space to be composed as a kind of target, in which certain spots or territories count more or less, both according to their distance from the centre and according to what fills them. Every element of a picture, in whatever way it gains power to excite motor impulses, is felt as expressing that power in the flat pattern. A noble vista is understood and enjoyed as a vista, but it is COUNTED in the motor equation, our "balance," as a spot of so much intrinsic value at such and such a distance from the centre. The skillful artist will fill his target in the way to give the maximum of motor impulses with the perfection of balance between them. It is thus in a kind of substitutional symmetry, or balance, that we have the objective condition or counterpart of aesthetic repose, or unity. From this point of view it is clearly seen in what respect the unity of Hildebrand fails. He demands in the statue, especially, but also in the picture, the flat surface as a unity for the three dimensions. But it is only with the flat space, won, if you will, by Hildebrand's method, that the problem begins. Every point in the third dimension counts, as has been said, in the flat. The Fernbild is the beginning of beauty, but within the Fernbild favorable stimulation and repose must still be sought. And repose or unity is given by symmetry, subjectively the balance of attention, inasmuch as this balance is a tension of antagonistic impulses, an equilibrium, and thus an inhibition of movement. From this point of view, we are in a position to refute Souriau's interesting analysis<1> of form as the condition for the appreciation of content. He says that form, in a picture for instance, has its value in its power to produce (through its fixation and concentration of the eye) a mild hypnosis, in which, as is well known, all suggestions come to us with bewildering vividness. This is, then, just the state in which the contents of the picture can most vividly impress themselves. Form, then, as the means to content, by giving the conditions for suggestion, is Sourieau's account of it. In so far as form--in the sense of unity--gives, through balance and equilibrium of impulses, the arrest of the personality, it may indeed be compared with hypnotism. But this arrest is not only a means, but an end in itself; that aesthetic repose, which, as the unity of the personality, is an essential element of the aesthetic emotion as we have described it. <1> _La Suggestion en l'Art_. VI