Oriel window
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An oriel window is a form of bay window which protrudes from the main wall of a building but does not reach to the ground. Supported by corbels, brackets, or similar cantilevers, an oriel window gener
Oriel window, Grande Île, Strasbourg
Oriel windows with elaborate detailing, Kłodzko, Poland
A 15th-century oriel window at Barnard Castle in County Durham, England.
Oriel windows in San Francisco, California, USA
Four-centred arch
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A four-centred arch or four-centered arch is a low, wide type of arch with a pointed apex. Its structure is achieved by drafting two arcs which rise steeply from each springing point on a small radius
Tudor arch at Layer Marney Tower, 1520s
Persian arches on the Si-o-se-pol bridge, Isfahan, c. 1600
The 17th century Buland Darwaza at Fatehpur Sikri has a four-centred archway with vaulted iwan.
Restored 9th century arches of the Qasr al-'Ashiq, Samarra.