hall of mirrors
A large room in which the decoration is composed to a large degree of mirrors. In the 18th century, when looking-glasses, originally coming from Venice, were esteemed, this kind of decoration was put to use. The most important instance is the Galerie des Glaces at Versailles, a room 240 feet long, with large windows on one side and mirrors in casings, or frames, opposite them, the mirrors being not in large sheets, which at that time were not to be had, but arranged like the panes or lights of a window with sash bars. (Jones, 1992)