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The drum roll of its mighty nave builds up to the spectacular retrochoir of double windows and weird sculptures.

The segmental arch, nearly flat, was still however used in doorways, and occasionally the semicircular also, as in the arches of the Retrochoir, Chichester Cathedral.

The architecture throughout the retrochoir is Early Decorated.

An octagonal chamber is transformed within into a pentagonal apse by the simple device of resting the three western sides on piers, and thus throwing it into one building with the retrochoir, thereby considerably enhancing the general artistic effect.