The connecting area between the four houses has an open joisted pine ceiling that offers a masterful transition between the coarse, weathered exterior and the polished rooms—all lined with smooth Sucupira wood and white plaster board. “We wanted to make a clear contrast between the interior surfaces of the house and the corresponding exterior surfaces,” de Carvalho says. Tagged: Staircase and Wood Tread.  House of Four Houses by Laura C. Mallonee