Spend a Saturday afternoon hunting for new interior accessories and you will return with a basket full of promises. A decorative tray will organize your keys. A throw blanket will add warmth. A ceramic vase will lend a sense of calm. These things are not lies exactly, but they are incomplete truths. The real battle in most homes is not about styling a shelf. It is about finding a place for your brother-in-law to sleep when he shows up unexpectedly with a duffel bag and a six-pack. It is about the guest room that does not exist because you live in a two-room apartment with a kitchen the size of a coat closet. I have been there. I have stared at a stack of folded sheets on a dining chair and wondered why I ever bought that brass fruit bowl.

The problem starts with the sleeping surface. A regular sofa looks fine in the showroom under warm lighting and two square cushions. You bring it home and it eats your living room.