The essence of childhood, of course, is play, which my friends and I did endlessly on streets that we reluctantly shared with traffic.

Cosby frames childhood as fundamentally defined by unstructured play—an activity pursued for its own sake rather than for achievement. The image of children “endlessly” playing in the street evokes a mid‑20th‑century urban neighborhood where public space doubled as a playground. The phrase “reluctantly shared with traffic” underscores both the children’s sense of ownership over their play-world and the encroachment of adult, modern life (cars, schedules, danger) into it. The quote thus nostalgically contrasts a child’s expansive freedom and imagination with the practical constraints imposed by the adult environment, suggesting that play is not a trivial pastime but the core experience through which childhood is lived.