AbstractThe principle of architecture is the creation of an “inside” or an interior. There are three layers of meaning involved in isolating and defining a space as an “inside”: the floor/earth, the wall/world, the ceiling/heavens. The three combined constitute and define a particular version of the archetypical “interior”: the room. Each architectural interior, though, is at the same time a closed space, on itself, and at the same time represents and relates to an “outside” or to the World. This article is published as part of a collection on interiorities.