This is the level at which the walls are pierced by windows to admit light to the building - the ‘clear story’. The etymology and the O.E.D. citation of 1454, as well as later uses, show an association with glazing, but Ruskin at Works, 9.39 seems to take a different view when he refers to the clerestory as made up of ‘large spaces of flat or dead wall...forming the upper part of the nave’.
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[Version 0.05: May 2008]