of Indiana limestone, the ceilings of its vaults are lined with Guastavino terracotta tiles, and its floor is made of marble. Three main vertical sections, which are split by buttresses, comprise the nave's eastern and western walls, each of which has five architectural bays along the portion of the nave adjacent to the aisles; each bay contains a pointed-arch window. Above the stained-glass windows of each bay is a triforium gallery with three colonettes, followed by two adjacent lancet windows in the clerestory, and topped with a rose window. Pointed arches resting on piers that contain engaged columns support each of the clerestory bays and serve as the bases for the ribs under the vaulted ceiling. The engaged columns are surmounted by Corinthian capitals that are decorated with scenes from the Book of Jeremiah. The ceilings of the vaults underneath the triforium galleries are faced with Guastavino tile and contain lighting. Above the clerestory, the nave's ceiling is eight stories high. It consists of several vaults, each of which is divided into four segments by diagonally interlocking transverse ribs that do not provide structural support. Eight iron lanterns hang from the transverse ribs and descend lower than the level of the triforium gallery. The vaults contain a finish of acoustic Guastavino tiles, which are mostly gray. The tiles above the chancel and the nave's northernmost two bays are brown because a sealant that was applied in 1953 to increase the organ's acoustical reach has turned yellow over time. The nave was built with a seating capacity of either 2,400, 2,408, or 2,500. The ground level contains 38 rows of oaken pews that have Gothic decoration; five additional rows of pews used to exist at the front of the nave. Two seating galleries overhang the southern portion of the nave. The lower gallery is made of carved wood, has rows of oaken pews on a downward slope, and contains a wooden ceiling with nine lamps. The upper gallery is also made of carved wood and contains oaken pews on a slope but there is no canopy above it. The upper gallery is illuminated with four lanterns that are similar to the eight above the main section of the nave. Behind the southern wall are six double-tiered niches with stone sculptures of ministers and Jacob Epstein's sculpture Christ in Majesty. The Trompeta Majestatis organ projects from the wall beneath the niches. Chancel,