System3 is a more conventional sort of prefab. Designed by Austrian architects Oskar Leo Kauffmann and Albert Rüff, it is assembled out of panels and three-dimensional components that arrive to the building site in a shipping container. Several finished modules are combined or stacked to make a house or can be piled up to create a multistory apartment building. System3 is most people's idea of contemporary prefabrication: It's elegant, stylish, and rather austere.