New York’s Gramercy Park is a curious institution: two acres of fenced-in greenspace that is accessible only to those who own the houses surrounding the park. (Non-residents must either stay at the Gramercy Park Hotel or join the Players Club or National Arts Club if they want to visit, and each of these institutions has a limited number of park keys.) Private parks like it are the exception, of course, not the rule: since the days of Frederick Law Olmsted, who campaigned for and designed city parks across North America (Central Park, in New York, and Montreal’s Mount Royal Park among them) we have come to expect most of our recreational spaces to be public. Cities and neighbourhoods are routinely rated on both the quantity and quality of their parks, and any suggestion that these services should be cut back always receives violent reactions from taxpayers; playgrounds, too, are public by default.