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A sconce is a type of light fixture affixed to a wall in such a way that it uses only the wall for support , and the light is usually directed upwards , but not always .. light fixture. light fixture. It does not have a base on the ground .. For this reason , lighting fixtures will need an electrical box to be installed .. A sconce may be a traditional torch , candle or gas light , or a modern electric light source affixed in the same way .. torch. torch. electric light. electric light. Modern fittings are more often called wall lights or similar terms , especially if the light source is wholly covered by glass .. Sconces can be placed on both the interior and exterior walls of buildings .. In pre-modern usage , these usually held candles and torches respectively .. Historically , candle sconces were often made of silver from the 17th century , with porcelain coming in in the 18th .. The etymology of sconce is from the Latin absconsus , and the French esconce signifying a covering or protection , or , by extension , that which is covered or protected .. Modern electric light fixture sconces are often used in hallways or corridors to provide both lighting and a point of interest in a long passage .. light fixture. light fixture. electric light. electric light. Sconce height in a passageway is generally 3 / 4 of the distance up the wall as measured from the floor to the ceiling , and the distance between sconces on the wall is generally equal to the distance of the sconces from the floor , often alternating sides of the passageway .. Sconces are typically installed in pairs or other multiple units to provide balance .. They can be used to frame doorways or line a hallway .. Swing arm sconces are often placed next to a bed to provide task lighting for reading .. task lighting. task lighting