Ontario Architecture
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The angle formed by meeting or intersection of two vaults. In the Norman era (1066 - 1300) these were left plain, but during the Gothic era these were almost invariably covered with ribs. For the Baroque architects, these were very ornate.

Park Guelle - Barcelona - Spain
Saint Hubert Chapel - Amboise - France (1500)
St. Denis - Paris - France (1200)
Tours Cathedral - France
L'Aquila - Italy (1300)
St. Peter's - Rome - Italy (1600)
Eglise Réformée - Bursins - Switzerland (13th c.)