Literature depicts children of the Global North withdrawing from public space to 'acceptable islands'. Driven by fears both of and for children, the public playgroundone such islandprovides clear-cut distinctions between childhood and adulthood. Extending this argument, this paper takes the original approach of theoretically framing the playground as a heterotopia of deviance, examiningfor the first timethree Greek public playground sites in relation to adjacent public space. Drawing on an ethnographic study in Athens, findings show fear to underpin surveillance, control and playground boundary porosity. Normative classification as 'children's space' discourages adult engagement. However, in a novel and significant finding, a paradoxical phenomenon sees the playground's presence simultaneously legitimizing playful behaviour in adjacent public space for children and adults. Extended playground play creates alternate orderings and negotiates norms and hierarchies, suggesting significant wider potential to reconceptualise playground-urban design for an intergenerational public realm.