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Gated residential communities, with their walls, fences and controlled access for outsiders, have been increasing in number in France since the 1990s. This development could be interpreted as reflecting a prevailing concern with law and order, but there are also grounds for investigating the resulting boundary effect by exploring the twin notions of permeability and impermeability: between the creation of impermeable barriers, symbolic boundaries and the pragmatism of residents, the closure gradient varies from one residential community to the next, complicating perceptions of an urban sphere where residential life is increasingly shut in.