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Scenes are mutually exclusive views of the application within a stage. Most applications provide different kinds of scenes within the same stage, while simple applications (such as Calculator) only have a single scene. Typically, a new scene is pushed after a user action, such as a tap on a UI widget, and the old scene can return with a "back" gesture. Scenes are managed by a scene stack, with new scenes pushed onto and off of the stack with the last scene visible.