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Clerestory
A clerestory ( ; lit.'clear storey', also clearstory, clearstorey, or overstorey; from Old French: cler estor) is a high section of wall that contains windows above eye level. Its purpose is to admit light, fresh air, or both. Historically, a clerestory formed an upper level of a Roman basilica or of the nave of a Romanesque or Gothicchurch, the walls of which rise above the rooflines of the lower aisles and are pierced with windows.
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