The practical use of a ghost light is for safety. A ghost light enables one to navigate the theatre to find the lighting control console and to avoid accidents such as falling into the orchestra pit and stepping on or tripping over set pieces. There is an unsubstantiated story of a burglar who tripped on a dark stage, broke his leg and sued the theatre for damages.[4]
Some claim that the tradition began in the days of gas-lit theatres when dim gas lights were left burning to relieve pressure on the gas valves.[5]
Aside from its obvious practical purpose, there are a number of superstitions associated with the origin and purpose of ghost lights.
The superstitious have various justifications for the ghost light in relation to the supernatural. A popular theatrical superstition holds that every theatre has a ghost, and some theatres have traditions to appease ghosts that reach far back into their history. For example, the Palace Theatre, London keeps two seats in its balcony permanently bolted open to provide seating for the theatre ghosts.[6] Similar superstitions hold that ghost lights provide opportunities for ghosts to perform onstage, thus appeasing them and preventing them from cursing the theatre or sabotaging the set or production. This is also used to explain the traditional one day a week that theatres are closed.[6] Some superstitions claim that the ghost light is in place to scare away ghosts, not to appease them.[7]