Filial love is different. It is not purely instinctive, but depends on intelligence. It is only possible if the child has the intelligence to see the parent as something besides a parent--as some one needing care and protection--and if the child himself takes a parental attitude towards the parent. But that is a grown-up attitude, seldom taken by {151} young children. It is not the infantile instinct, which, if there is such an instinct, is the spring of trustful, docile, dependent, childlike and childish behavior. The Play Instincts Any instinct has "play value", but some have also "survival value" and so are serious affairs. Survival value characterizes the instincts we have already listed, both the responses to organic needs and the responses to other people. But there are other instincts with less of survival value, but no less of play value, and these we call the play instincts, without attaching any great importance to the name or even to the classification. Playful activity. The kicking and throwing the arms about that we see in a well-rested baby is evidently satisfying on its own account. It leads to no result of consequence, except indeed that the exercise is good for the child's muscles and nerves. The movements, taken singly, are not uncoordinated by any means, but they accomplish no definite result, produce no definite change in external objects, and so seem random and aimless to adult eyes. It is impossible to specify the stimulus for any given movement, though probably stimuli from the interior of the body first arouse these responses. They are most apt to occur during the organic state of "euphoria", and tend to disappear during fatigue. There is a counter-tendency to this tendency towards general activity, and that is _inertia_, the tendency towards inactivity or _economy of effort_. Most pronounced in fatigue, this also appears in lassitude and inert states that cannot be called fatigue because not brought on by excessive activity. After sleep, many people are inert, and require a certain amount of activity to "warm up" to the active condition. As the child grows older, the {152} "economy of effort" motive becomes stronger, and the random activity motive weaker, so that the adult is less playful and less responsive to slight stimuli. He has to have some definite goal to get up his energy, whereas the child is active by preference and just for the sake of activity.