This paper relates the history of playground provision in New York to changing conceptions of childhood, and specifically to a felt need to ’contain’ children in order to keep them off the streets, safe from traffic and unsavoury influences – a trend that children have tended to resist. Playgrounds most often substitute a narrow range of physical activity for the spontaneous play in diverse environments that children more naturally crave. Not only do playgrounds fail to satisfy the complexity of children’s developmental needs, they also tend to separate children from the daily life of their communities – exposure to which is fundamental to the development of civil society. What is needed, argues the author, is not more segregated playgrounds, but a greater attempt to make neighbourhoods safe and welcoming for children, responding to their own preferences for free play close to home.