Traditional art, what is in the picture?

Pull-up film: Pull-up film is a traditional folk art of Han nationality in China. The number of performers is usually 1. The props used are wooden boxes with lenses installed around them. The box is equipped with several pictures, which are illuminated by lights. During the performance, the performer pulls the rope outside the box and scrolls the picture. The audience observes the changes of the picture through the lens. Usually the built-in picture is a complete story or related content. Performers also sing songs to explain the contents of the pictures.