Some of the rack was removed last week to create a gap in front of the main door.

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The air-gap solution, though, leaves the door wide open to misconfigurations.

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Next-door neighbours were looking down at us through the gap from their tiny dwellings just feet away, as we climbed the stairs to her bedroom - a curtain serving as a door because the lower half was missing.

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Leandro Erlich's "Stuck Elevator" (2011) is more complex: A freestanding box, about the size of an elevator shaft, it reveals, through an open door, the elevator's lifting mechanism and, through a gap at the bottom, the interior of the cabin, with a newspaper on the floor.

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There was a gap of almost four and a half and five hours between the police arriving at my door and entering my home.

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