Until the 1980s—and in rare cases today—playgrounds were places for social experiments, risky projects and spectacular sculptures. Architects, urban planners, artists, parents and children were invited to leave their comfort zone and venture into something new. A focal point for ideas about education and childhood, about urban planning and public space, about architecture and art, about creativity and control, the playground has repeatedly resisted institutional and ideological appropriation and grown in its own, sometimes anarchic, ways. The Playground Project will bring back many exemplary, but now often forgotten playground initiatives, pioneering acts and adventures with a playground in which children (and inner children) can run, hide, climb and imagine.