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The evolution of the pointed arch in Islamic architecture was associated with increases between the centers of the circles forming the two sides of the arch (making the arch less "blunt" and more "sharp"), from 1 ⁄ 10 of the span in Qusayr 'Amra (712-715 AD), to 1 ⁄ 6 in Hammam as-Sarah (725-730), to 1 ⁄ 5 in Qasr Al-Mshatta (744), and ...
The defining characteristic of the Gothic style is the pointed arch, which was widely used in both structure and decoration. The pointed arch did not originate in Gothic architecture; they had been employed for centuries in the Near East in pre-Islamic as well as Islamic architecture for arches, arcades, and ribbed vaults. [56]
The vertical plan of early Gothic cathedrals had three levels, each of about equal height; the clerestory, with arched windows which admitted light on top, under the roof vaults; the triforium a wider covered arcade, in the middle; and, on the ground floor, on either side of the nave, wide arcades of columns and pillars, which supported the weight of the ceiling vaults through the ribs
Thanks to the pointed arch employed in Gothic architecture, builders could raise or lower the arches so they would have the same height for a short span or a long span, something not possible with round arches. Pointed arches also made two intersecting vaults of the same height but different widths easier to construct. [13]
An accolade is a pointed arch composed of two ogee curves, also known as sigmoid lines, which mirror one another. [3] [1] It can be formed by a pair of reverse ogee curves over a three-centred arch ending in a vertical finial. [4] [5] The form can also be described as the combination of a convex arch and a concave arch. [6]
Gothic architecture features ogives as the intersecting transverse ribs of arches which establish the surface of a Gothic vault. An ogive or ogival arch is a pointed, "Gothic" arch, drawn with compasses as outlined above, [where?] or with arcs of an ellipse as described. A very narrow, steeply pointed ogive arch is sometimes called a "lancet arch".