" Adult direction leads to the assumption that rules are determined by an outside authority and thus not to be questioned. When children play just among themselves, however, they come to realize that rules are merely conventions, established to make the game more fun and more fair, and can be changed to meet changing conditions. For life in a democracy, few lessons are more valuable. "

― Peter O. Gray , Free to Learn: Why Unleashing the Instinct to Play Will Make Our Children Happier, More Self-Reliant, and Better Students for Life