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For example, archaeologist Cédric Moulis of the University of Lorraine painstakingly reassembled dozens of wedge-shaped stones called voussoirs recovered from the collapsed vaulted ceiling over the nave to glean insights into their mechanical properties.

The masons put together the pieces of the rose window and installed the tympanums and voussoirs over the doors.

The Damascus room has painted and carved wood walls, a stone wall fountain and an arch of colorful plaster voussoirs.

He learns the endless terms, the vocabulary that classifies the details of ancient buildings, writing them on separate index cards and making illustrations on the back: architrave, entablature, tympanum, voussoir.

On either side of this are two columns of red Vermont marble with white marble capitals and bases, on which rests a broad archivolt enriched with sculpture and varied by voussoirs, alternately white and gray.