The unusual home seen on this 1966 cover showcases then-contemporary innovations in structural concrete, as seen in this clamshell design. Located in Genesee, Colo., the striking structure sits atop a pedestal composed of concrete columns. The building was designed to be three stories, with the lowest floor housing a library built into the hillside, a glass-enclosed ground floor ringed by columns, and the clamshell containing three bedrooms, three baths, living room, dining room, kitchen and sun deck, all connected by an elevator. The ENR profile of the architect, Charles Deaton, described how he “plastically shapes a building as a free-form sculpture, only intuitively being guided by structural purpose, until he achieves a satisfactory form. Thereafter he fits structure to form.” The clamshell is a welded cage of standard steel shapes serving as a structural skeleton, covered with metal mesh and pneumatically applied shotcrete.…