The cylinder house is designed to fit between the trees of a wooded lot near Lyon, France. For this house, the plan is based on a juxtaposition of a simple element, a cylinder. This cylinder can be opened, semi-open, closed, whatever its disposition it participates in the delimitation of space. It is an open plan, with the cylinder pieces as posts. There is a play of height offset on the cylinders to also provide a delimitation by the height of the ceilings. There are no corridors in this house nor windows marked, everything is traffic and everything is open to the outside.