Tracery
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Tracery is an architectural device by which windows are divided into sections of various proportions by stone bars or ribs of moulding. Most commonly, it refers to the stonework elements that support
Plate tracery, Laon Cathedral, north rose window
Plate tracery, Lincoln Cathedral "Dean's Eye" rose window (c. 1225)
Rayonnant bar tracery, Notre-Dame de Paris, north rose window
Bar tracery with cusped circles, Reims Cathedral, apse chapel
Mullion
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A mullion is the element that forms a division between units of a window or screen, or is used decoratively. When dividing adjacent window units its primary purpose is a rigid support to the glazing o
Tracery
…slab. Bar tracery was then implemented, having derived from the plate tracery. However, instead of a slab, the windows were defined by moulded stone mullions, which were lighter and allowed for more openings and intricate designs. Pointed arch windows of Gothic buildings were initially (late 12th–late 13th…
A mullioned window in the church of San Francesco of Lodi, Lombardy