■ Illuminate the performance and allow the audience to see the actors' performances and images of the scenery; ■ Guide the audience's eyes; ■ Shape characters, emphasize emotions and present stage illusions; ■ Create the spatial environment needed in a play; ■ Render the atmosphere of the play; ■ Show the time and space transition, highlight the conflict and strengthen the rhythm of the stage, rich in artistic impact. Sometimes also with stage stunts. ​