page_title: Clerestory
section_title: History
hierarchical_section_title: Clerestory / History
context_page_description: In architecture, a clerestory is a high section of wall that contains windows above eye level. The purpose is to admit light, fresh air, or both.
  Historically, clerestory denoted 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.
  Similar structures have been used in transportation vehicles to provide additional lighting, ventilation, or headroom.
caption: The walls of the clerestory of the basilica-shaped cathedral of Monreale, Italy are covered with mosaic
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