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Mullions are the large vertical or radiating members that separate the lights in a window. Mullions reinforce the design of the building and are often embellished in the Gothic and Art Deco periods. The smaller members that separate each pane of glass are the muntins.

Brussels - Belgium
Château d'Amboise - France (1500)
Winchester - England
Canford School - England
Parc Güell - Gaudi - Barcelona - Spain
Château Chenonceau - France (1504)