The casement or sash, fitted with glass, which closes an opening in the wall of a structure but has access to light and air, is the basic definition of a window. However, it may have a square, round, or pointed head, it may also be single, double, or grouped. In relation to the wall, it may be flush, recessed, or projected. A projected window is called a bay window if polygonal, if it is semicircular it's called a bow window, an oriel if it has corbelled brick or stone supports. A mullioned window is divided by slender bars into panes, when the
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