The document discusses the concept of flexible housing, which can adjust to changing needs and patterns both socially and technologically. It provides examples of flexible housing designs from history, including projects from the 1920s-1980s that allowed reconfiguration of interior spaces. The principles of flexible housing are described as including adaptable space, construction, design for adaptation, layered structures, typical floor plans, and services. Advantages include accommodating different lifestyles over time and increasing housing affordability.