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In architecture, the apse (Latin absis "arch, vault"; sometimes written apsis; plural apses) is a semicircular recess covere with a hemispherical vault. In Romanesque, Byzantine and Gothic Christian abbey, cathedral and church architecture, the term is applied to the semi-circular or polygonal section of the sanctuary at the liturgical east end beyond the altar. Geometrically speaking, an apse is either a half-cone or half-dome.

Trivia about apse

  • Where the altar & seats for the choir are located, it's a semicircular area at end of nave
  • (Jimmy of the Clue Crew shows a floor plan on the monitor.) In a cruciform church, the central part is called the nave; it ends in a recessed area that is usually vaulted called this