|·||abandonLocation - This is the location where objects located in a SpaceOverlay (Underside, RearContainer or RearSurface) end up when the SpaceOverlay is moved. By default, this will be the immediate container of the SpaceOverlay. For example, if the SpaceOverlay represents the underside or rear of a dressing table, if the dressing table is moved, then we would expect whatever was behind it to stay put in the dressing table's original location. You can override abandonLocation to some other location if that's where objects in the SpaceOverlay should fetch up, or set it to nil if you want objects in the SpaceOverlay to move with the SpaceOverlay (because they're to be considered attached to the underside or rear of the object that's moved). In addition, any object of class Component in a SpaceOverlay will always move with the SpaceOverlay, since a Component is assumed to be attached to its parent object.