Shapes: Torus

Not as space-efficient as a dome, but it has some fun applications, i.e. a home with a center courtyard or garden. A good alternative to the full torus is a half-torus. With a half-torus, you don’t have to go through the living room to get to the courtyard. The dome facing a pond or some other feature, with access through a fence or a courtyard, has a lot of merit.