It is a shared house for 7 residents. Inside the 6m-wide, 12m-long, and 10m-high box, 4 smaller boxes contain 7 private rooms. It is an ensemble of working and residence spaces: furniture studio/lavatory (1F), private rooms/toilet (2F), and kitchen/lounge (3F). The facade is semi-transparent canvas. The architectural design gave leeway in the spaces to allow residents create their own style. Our task was to design optimum light for working and residence spaces with a tight budget in a short construction schedule. We emphasized the boxlike architecture, allowed flexibility in the spaces, and minimized the light fixtures to keep to the budget.