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.
A Romanesque clerestory at St Michael's Church, Malton
Triforium
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A triforium is an interior gallery, opening onto the tall central space of a building at an upper level. In a church, it opens onto the nave from above the side aisles; it may occur at the level of th
Clerestory
…clerestoried church was of two levels: arcade and clerestory. During the Romanesque period, a third level was inserted between them, a gallery called the triforium or tribune. The triforium generally opens into space beneath the sloping roof of the aisle. This became a standard feature of later Romanesque and…
A Romanesque triforium gallery, Cathedral of Saint Mary Major, Lisbon
The triforium at Lincoln
The matroneum of Pisa Cathedral protected by triforia and bifora
The Roman forum; note people looking out from the triforium of the Basilica Julia, above left. The arches on both sides of the basilica's triforium were unglazed.