Also a Gerber sofa is based on a flat 2D world. Tilting the sofa to get around a 3D corner seems a reasonable solution. Presumably there's another Sofa design

Also a Gerber sofa is based on a flat 2D world. Tilting the sofa to get around a 3D corner seems a reasonable solution. Presumably there's another Sofa design for the maximum that can get around a 3D corridor corner (and what height do you choose for the corridor given humans tend to choose corridors that are taller than they are wide?)