But the sensuous beauty of art does not exhaust the aesthetic experience. What of the special emotions--the gayety or triumph, the sadness or peace or agitation--that hang about the work of art, and make, for many, the greater part of their delight in it? Those among these special emotions which belong to the subject-matter of a work--like our horror at the picture of an execution--need not here be discussed. To understand the rest we may venture for a moment into the realm of pure psychology. We are told by psychology that emotion is dependent on the organic excitations of any given idea. Thus fear at the sight of a bear is only the reverberation in consciousness of all nervous and vascular changes set up instinctively as a preparation for flight. Think away our bodily feelings, and we think away fear, too. And set up the bodily changes and the feeling of them, and we have the emotion that belongs to them even without the idea, as we may see in the unmotived panics that sometimes accompany certain heart disturbances. The same thing, on another level, is a familiar experience. A glass of wine makes merriment, simply by bringing about those organic states which are felt emotionally as cheerfulness. Now the application of all this to aesthetics is clear. All these tensions, relaxations,--bodily "imitations" of the form,--have each the emotional tone which belongs to it. And so if the music of a Strauss waltz makes us gay, and Handel's Largo serious, it is not because we are reminded of the ballroom or of the cathedral, but because the physical response to the stimulus of the music is itself the basis of the emotion. What makes the sense of peace in the atmosphere of the Low Countries? Only the tendency, on following those level lines of landscape, to assume ourselves the horizontal, and the restfulness which belongs to that posture. If the crimson of a picture by Bocklin, or the golden glow of a Giorgione, or the fantastic gleam of a Rembrandt speaks to me like a human voice, it is not because it expresses to me an idea, but because it impresses that sensibility which is deeper than ideas,--the region of the emotional response to color and to light. What is the beauty of the "Ulalume," or "Kubla Khan," or "Ueber allen Gipfeln"? It is the way in which the form in its exquisite fitness to our senses, and the emotion belonging to that particular form as organic reverberation therefrom, in its exquisite fitness to thought, create in us a delight quite unaccounted for by the ideas which they express. This is the essence of beauty,--the possession of a quality which excites the human organism to functioning harmonious with its own nature.