Focusing on England between 1935 and 1959, this book examines a selected group of innovative buildings and environments that were designed for children or addressed their needs, such as playgrounds, schools, community centers, hospitals, dwellings and neighborhoods. It identifies the new aesthetic and spatial order permeating the environments of childhood, based on endowing children with the agency and autonomy to create a self-regulating social order out of their own free will, while rendering their interiority and sociability observable and governable.