You know them by their odd-sized and often tall windows, their lack of ornamentation, and their unusual mixtures of wall materials--stone, brick, and wood, for instance. Architects designed Contemporary-style homes (in the Modern family) between 1950 and 1970, and created two versions: the flat-roof and gabled types. The latter is often characterized by exposed beams. Both breeds tend to be one-story tall and were designed to incorporate the surrounding landscape into their overall look.