Sec. 4. We have here, then, an important element of the distinction between aesthetic and moral values. It is the same that has been pointed to in the famous contrast between work and play. These terms may be used in different senses and their importance in moral classification differs with the meaning attached to them. We may call everything play which is useless activity, exercise that springs from the physiological impulse to discharge the energy which the exigencies of life have not called out. Work will then be all action that is necessary or useful for life. Evidently if work and play are thus objectively distinguished as useful and useless action, work is a eulogistic term and play a disparaging one. It would be better for us that all our energy should be turned to account, that none of it should be wasted in aimless motion. Play, in this sense, is a sign of imperfect adaptation. It is proper to childhood, when the body and mind are not yet fit to cope with the environment, but it is unseemly in manhood and pitiable in old age, because it marks an atrophy of human nature, and a failure to take hold of the opportunities of life. Play is thus essentially frivolous. Some persons, understanding the term in this sense, have felt an aversion, which every liberal mind will share, to classing social pleasures, art, and religion under the head of play, and by that epithet condemning them, as a certain school seems to do, to gradual extinction as the race approaches maturity. But if all the useless ornaments of our life are to be cut off in the process of adaptation, evolution would impoverish instead of enriching our nature. Perhaps that is the tendency of evolution, and our barbarous ancestors amid their toils and wars, with their flaming passions and mythologies, lived better lives than are reserved to our well-adapted descendants. We may be allowed to hope, however, that some imagination may survive parasitically even in the most serviceable brain. Whatever course history may take, -- and we are not here concerned with prophecy, -- the question of what is desirable is not affected. To condemn spontaneous and delightful occupations because they are useless for self-preservation shows an uncritical prizing of life irrespective of its content. For such a system the worthiest function of the universe should be to establish perpetual motion. Uselessness is a fatal accusation to bring against any act which is done for its presumed utility, but those which are done for their own sake are their own justification.