This course postulates that interiorization is a material and spatial condition that can be traced through history. Developing form a history and theory of the urban, we will use the lens of the interior to chart a certain tendency of this spatial order across the twentieth century and up to the present day. Through a rigorous examination of architectural and urban case studies, we will look at how the urban has been constructed physically, socially, legally, economically and politically as a ‘pure interior’—a space without an exterior, whose curious capacity is to reproduce all of its ‘opposites’ within its totalizing space.