Clerestory (; lit. clear storey, also clearstory, clearstorey, or overstorey) is an architectural term denoting an upper level of a Roman basilica or of the nave of a Romanesque or Gothic church, the walls of which rise above the rooflines of the lower aisles and are pierced with windows. The Romans also used clerestories in their basilica-like baths and palaces, and probably derived the clerestory from the Hellenistic architecture of the Greeks. The clerestory originated in the temples of Egypt… (More on Clerestory)