Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A fly system is a system of ropes, counterweights, pulleys, and other related devices within a theatre that enables a technical crew to quickly move components such as curtains, lights, and set pieces on and off stage by moving them vertically between the stage and the large opening above the stage. This is in contrast to the other two types of theatrical component transport systems, scenery wagons and stage lifts, which are only used to move set pieces and which do so without utilizing the space above the stage.

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