Finding a sofa is a trifecta of requirements. You want a model that converts from cosy Netflix sessions to the Land of Nod. You want something that fits into a corner of your living room or spare ...

Say you want to move a two-dimensional shape — your sofa (disregarding its height) — through an L-shaped hallway. For simplicity, assume the hallway is one unit wide. What’s the size of the largest ...