In architecture, clerestory ( /ˈklɪərstɔri/; lit. clear storey, also clearstory, clearstorey, or overstorey) are any high windows above eye level. The purpose is to bring outside light and/or fresh air into the inner space.
In modern Manor style homes or mansions a "clerestory" is an entry foyer that is usually a minimum of two stories tall and has arched windows or other types of windows in the upper section to light the foyer.