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Here is a curious space. On the roof of a shopping centre in the predominantly Chinese and south Asian neighbourhood of Olympiades (13th arondissement) a space of about 5 by 10 metres is delineated by a low wall. So low I'm not sure it qualifies as a wall. It has a clear entrance, carefully positioned to bring one in to the space diagonally.
Perhaps it is a space that was supposed to become another Vietnamese restaurant, or a shop selling brightly coloured plastic kitchenware, flourescent pink fake lotus flowers, and those ornamental cats with a waving arm.
At the moment it is a space for doing whatever you want (within the realms of what is acceptable to do in any public space).