As its primary purpose is protection, architecture as we know it involves the use of opaque, solid, rigid materials, totally impermeable from the outside. However, even before living in a building, people live in an invisible element which is not often considered but is in symbiosis with our bodies: Air. Blocking out all porosity with air seems incompatible with our primary needs and reveals the obsolescence of architecture. Through a new way of looking at our environment, this dissertation questions the psychological and material qualities of the element. What relationship do we have with air? How do we live in it?