This image shows a typical choir from a bird's eye view.  Several altars are visible. The area of clerical performance is separated by a choir screen from the space of the laity. The clergy would gather as specified times during the day in the seats (choir stalls).  Their prayers were conducted with a major emphasis on the recitation of the 150 Psalms.  In antiphonal responses, one group calling to the other - clergy to the left (north) answered those on the right (south). (Viollet-le-Duc, Architecture, 3:235: Saint-Denis). back to "worship"