Also curved, yet at odds with the first example, are these DomeHouses from Korea. Where the hillside house is custom inside and out, the DomeHouse is a prefabricated construction purported to take four hours for a few people to build. Bucky Fuller might be proud, given that they are prefab, round (enclosing the most space) and extremely lightweight. I'm not sure about those square windows inserted into the domes, though.