This paper investigates the wall-passages, based on typological study on their ceilings. It is demonstrated that wall-passages in Norman Romanesque architecture were normally transversally barrel vaulted above each opening, whereas those in Gothic architecture were vaulted by one barrel vault per each bay, often accompanied by independent screen-like arcades, or covered by flat ceilings. This difference leads to the difference between the spaces they have realised. Furthermore, their structural characteristics also represent clear difference of attitudes toward the construction of wall-passages and walls themselves.
