Abstract: A door is provided for restricting access through a doorway aperture. The door is defined at one or more peripheral faces, and is movable between a closed position in which the door is substantially aligned with the doorway aperture and an open position in which the door is pivoted from alignment with the doorway aperture to either side of the doorway aperture. The door has a door member defining a pair of major faces and at least one minor face at a peripheral edge of the major faces where a cross-section of at least one of the minor faces of the door member is configured to be substantially curved, so that in operation when the door is moved between its open position and closed position from either side of the doorway aperture, the minor faces remain proximate to at least one peripheral face of the doorway aperture.