The metaphor of the third skin points to a bodily understanding of living. The first skin expands into textile coverings and into walls, ceilings, and floors within the cultural space. The evolution of these elemental forms of roof, wall, door, and window from the Stone Age to postmodernity also reflects the developmental history of human consciousness. In this context, prenatal life occupies a significant space - the uterus and placenta are our first home. Against this backdrop, houses and architectural styles can be understood as expressions of our basic psychological needs; the way we live influences our emotional well-being, which we regulate through opening and closing, leaving and returning, collecting and decluttering. The book is aimed not only at professionals such as psychoanalysts, architects, and cultural scientists, but also at people who seek the fundamental.