Sec. 14. The function of reproduction carries with it not only direct modifications of the body and mind, but a whole set of social institutions, for the existence of which social instincts and habits are necessary in man. These social feelings, the parental, the patriotic, or the merely gregarious, are not of much direct value for aesthetics, although, as is seen in the case of fashions, they are important in determining the duration and prevalence of a taste once formed. Indirectly they are of vast importance and play a great role in arts like poetry, where the effect depends on what is signified more than on what is offered to sense. Any appeal to a human interest rebounds in favour of a work of art in which it is successfully made. That interest, unaesthetic in itself, helps to fix the attention and to furnish subject-matter and momentum to arts and modes of appreciation which are aesthetic. Thus comprehension of the passion of love is necessary to the appreciation of numberless songs, plays, and novels, and not a few works of musical and plastic art. The treatment of these matters must be postponed until we are prepared to deal with expression -- the most complex element of effect. It will suffice here to point out why social and gregarious impulses, in the satisfaction of which happiness mainly resides, are those in which beauty finds least support. This may help us to understand better the relations between aesthetics and _hedonics,_ and the nature of that objectification in which we have placed the difference between beauty and pleasure. So long as happiness is conceived as a poet might conceive it, namely, in its immediately sensuous and emotional factors, so long as we live in the moment and make our happiness consist in the simplest things, -- in breathing, seeing, hearing, loving, and sleeping, -- our happiness has the same substance, the same elements, as our aesthetic delight, for it is aesthetic delight that makes our happiness. Yet poets and artists, with their immediate and aesthetic joys, are not thought to be happy men; they themselves are apt to be loud in their lamentations, and to regard themselves as eminently and tragically unhappy. This arises from the intensity and inconstancy of their emotions, from their improvidence, and from the eccentricity of their social habits. While among them the sensuous and vital functions have the upper hand, the gregarious and social instincts are subordinated and often deranged; and their unhappiness consists in the sense of their unfitness to live in the world into which they are born.