Ogee
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An ogee is an object, element, or curve—often seen in architecture and building trades—that has a serpentine or extended S shape. Ogees consist of a double curve, the combination of two curves that, a
Gothic ogee arch from the 1300s, over a tomb effigy in recess, in St. Mary the Virgin, Silchester, in the United Kingdom.
An unorthodox ogee arch in Kilfane Church, Ireland (13th century)
Ogee clock, framed with ogee moulding.
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