George Teyssot addresses theoretical issues related to the intrusion of the public sphere into private space and to the blurring of the notions of interior, privacy, and intimacy in our societies. In this way, the lecture attempts to rethink design in terms of a new definition of the practices of daily life. For instance, it explores the threshold, the interstitial space that divides the world in two. Similar to the wall, this space has two faces (surfaces) and no depth. By extension, the inhabitant can be understood only as a surface, an exteriority that always comes between things, inserting itself like doors and windows, walls and screens. Such a thought entails a reconsideration of the body, so than it can inhabit the world and negotiate transactions with the multiple spheres of physical and mental comfort, media, and information. Georges Teyssot has taught at Princeton University where he directed the PhD program in architecture. Presently he teaches at Laval University, Quebec.