A tall, narrow mirror, often running from floor to ceiling, which covers the whole or a large part of the wall between two windows.

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A pier glass is a mirror which is placed on a pier, i.e. a wall between two windows supporting an upper structure. It is therefore generally of a long and tall shape to fit the space. It may be as a hanging mirror or as mirrored glass affixed flush to the pier, in which case it is sometimes of the same shape and design as the windows themselves. This was a common decorating feature in the reception rooms of large 18th century houses. An incorrect example is commonly given as the Hall of Mirrors at the Palace of Versailles and Sanssouci Palace, yet the piers of these rooms are actually faced with pilasters, not pier glass. The mirrored glass is on the internal wall in a shape imitating the windows opposite. True pier glasses are found in the long galleries of many 18th. c. houses.
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