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The True Definition of a Window 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 …

…often takes the place of glass. Shell, also used in China, was employed by the Romans, as were thin panes of marble, mica, and horn. In modern architecture the use of windows has greatly increased in dwellings and in the exterior walls of factories and commercial buildings. Windows long ago used simply for the function of light and air, today provide the finishing touch of beauty with its wide variety and new dimension. ------------------------------------------------------------------------ **Bibliography**