(Kelly of the Clue Crew shows an architectural plan on the monitor.) Leading from the entry to the altar, it's this section of a church that's flanked by the aisles
Although medieval churches are usually oriented with the altar on the east
... [DOC] [TLE] Cathedral floorplan - Wikipedia [PAR] In Western ecclesiastical architecture, a cathedral diagram is a floor plan 
showing the sections of walls and piers, giving an idea of the profiles of their 
columns and ribbing.