So what's the alternative to standard-issue playgrounds? Solomon envisions multipurpose, multigenerational urban parks that incorporate spaces where kids can take charge of their own play. Instead of a fixed bridge in a plastic fort, they would have to use their imagination to decide which objects could be converted to play equipment. Such a challenging play space also would include nooks where kids could temporarily escape the nervous gaze of their caregivers. There would be no fences, plenty of trees and bushes, and good seating.