One of the interesting aspects of the study of children's play is that it permits us to see clearly how an awareness of rules is built up in us against factors of wildness, and how this awareness of rules, little by little, pervades the child's behavior. Now, the child's experience can inform us about the experience of the species: if the processes of the acquisition of self-control cannot be exactly the same, as Stanley Hall thought, the very differences allow us to specify the importance and exact role of an environment which is not the same for the child and for early mankind. For example, the existence of a coherent, stable, adult group makes for the institutionalization and perpetuation in terms of an adult tradition of behavior which, in the child, cannot take on its full development for lack of that social, and so to speak, institutional co-efficient. Thus, all at once, childhood turbulence is transformed into adult techniques of ecstacy and intoxication, or playing according to rules, sloughs off in the adult as religion, art, or even philosophy.