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There are four or five accepted and cognate meanings of spandrel in architectural and art history, mostly relating to the space between a curved figure and a rectangular boundary - such as the space between the curve of an arch and a rectilinear bounding moulding, or the wallspace bounded by adjacent arches in an arcade and the stringcourse or moulding above them, or the space between the central medallion of a carpet and its rectangular corners, or the space between the circular face of a clock and the corners of the square revealed by its hood. Also included is the space under a flight of stairs, if it is not occupied by another flight of stairs.
In a building with more than one floor, the term spandrel is also used to indicate the space between the top of the window in one story and the sill of the window in the story above. The term is typically employed when there is a sculpted panel or other decorative element in this space, or when the space between the windows is filled with opaque or translucent glass, in this case called spandrel glass. In concrete or steel construction, an exterior beam extending from column to column usually carrying an exterior wall load is known as a spandrel beam.
The spandrels over doorways in Perpendicular work are generally richly decorated. At Magdalen College, Oxford is one which is perforated. The spandrel of doors is sometimes ornamented in the Decorated period, but seldom forms part of the composition of the doorway itself, being generally over the label.
Spandrels can also occur in the construction of domes and are typical in grand architecture from the medieval period onwards. Where a dome needed to rest on a square or rectangular base, the dome was raised above the level of the supporting pillars, with three-dimensional spandrels called pendentives taking the weight of the dome and concentrating it onto the pillars.
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