House NA by Sou Fujimoto Architects is a 914 square-foot transparent house. It is comprised of 21 individual floor plates ranging from 18 to 21 square-feet, which can be used as 21 different rooms. And yet, with essentially no interior walls, it can feel like a large one-room house. Fujimoto drew this dichotomy from the concept of living in the treetops: a tree is a unified whole without separate compartments, however there are many branches to provide individual space. The structure consists of a thin white steel frame, complemented by white-tinted birch flooring. The HVAC and plumbing equipment, storage, and lateral bracing are located in the thick, north-facing wall at the rear of the house. The home’s airiness is naturally efficient in the summer, so to help during the cooler months some of the floor plates have in-floor heating.