Stage machinery, also known as stage mechanics,[1][2] comprises the mechanical devices used to create special effects in theatrical productions,[3] including scene changes, lowering actors through the stage floor (traps) and enabling actors to 'fly' over the stage.[4][5][6]
Alexandra Palace Theatre, London and the Gaiety Theatre, Isle of Man are two theatres which have retained stage machinery of all types under the stage.[7][8][9]