Clerestory
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A clerestory is a high section of wall that contains windows above eye level. Its purpose is to admit light, fresh air, or both.
The church of St Nicholas, Stralsund in Germany – the clerestory is the level between the two green roofs, reinforced here by flying buttresses
The walls of the clerestory of the basilica-shaped Cathedral of Monreale, Italy, covered with mosaics
Front-view profile of Great Hypostyle Hall, an early example of a clerestory.
Malmesbury Abbey, Wiltshire, England. The nave wall is divided into three stages: the upper stage with windows is the clerestory, beneath it is the triforium, and the lowest stage is the arcade.
Nave
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The nave is the central part of a church, stretching from the main entrance or rear wall, to the transepts, or in a church without transepts, to the chancel. When a church contains side aisles, as in
The nave of the Saint-Sulpice Church in Paris
The nave of the Santa Monica Parish Church in Sarrat, Philippines
A fresco showing Old St Peter's Basilica, built in the 4th century: the central area, illuminated by high windows, is flanked by aisles.
Late Gothic fan vaulting (1608, restored 1860s) over the nave at Bath Abbey, Bath, England. Suppression of the triforium offers a greater expanse of clerestory windows.