There are two acts and three acts on the opera stage, which are used at the beginning and end of the play or when props occupy the frontcourt. The second act is often used at the beginning and end of each small scene, provided that the prop set needs to be changed. If you don't change it, you can do it without lighting. The third act is a red gauze curtain, a yellow gauze curtain or other performances aimed at this scene. Huang San curtains are generally used in palaces such as the Imperial Palace and Jin Dian, pink curtains are used indoors by prime ministers or senior families, and red gauze curtains are only used for weddings, birthdays or embroidered buildings, and then matched with various scenes, such as Jin Dian scenery, home scenery, landscape garden scenery and so on. Other stages and this one are almost the most complete on the opera stage.