The Box House is a floating cube perched on concrete piers. Three sides are uninsulated timber, one and a quarter inches thick, and the fourth, the north and sun-facing side, is entirely of glass, with bifold doors on the lower level that open onto a deck overlooking fields, trees and hills. The house is 20 feet high by 20 feet long by 20 feet wide, a scant 400 square feet. But the double-height ceiling, cubic space and transparent north facade make it feel spacious. NY Times