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Paley’s book Boys and Girls is about the year she spent trying to get her pupils to behave in a more unisex way. And it is a chronicle of spectacular and amusing failure. None of Paley’s tricks or bribes or clever manipulations worked. For instance, she tried forcing the boys to play in the doll corner and the girls to play in the block corner. The boys proceeded to turn the doll corner into the cockpit of a starship, and the girls built a house out of blocks and resumed their domestic fantasies. Paley’s experiment culminated in her declaration of surrender to the deep structures of gender. She decided to let the girls be girls. She admits, with real self-reproach, that this wasn’t that hard for her: Paley always approved more of the girls’ relatively calm and prosocial play. It was harder to let the boys be boys, but she did. “Let the boys be robbers,” Paley concluded, “or tough guys in space. It is the natural, universal, and essential play of little boys.” I’ve been arguing that children’s pretend play is relentlessly focused on trouble. And it is. But as Melvin Konner demonstrates in his monumental book The Evolution of Childhood, there are reliable sex differences in how boys and girls play that have been found around the world. Dozens of studies across five decades and a multitude of cultures have found essentially what Paley found in her midwestern classroom: boys and girls spontaneously segregate themselves by sex; boys engage in much more rough-and-tumble play; fantasy play is more frequent in girls, more sophisticated, and more focused on pretend parenting; boys are generally more aggressive and less nurturing than girls, with the differences being present and measurable by the seventeenth month of life. The psychologists Dorothy and Jerome Singer sum up this research: “Most of the time we see clear-cut differences in the way children play. Generally, boys are more vigorous in their activities, choosing games of adventure, daring, and conflict, while girls tend to choose games that foster nurturance and affiliation.
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