Shadow play (Chinese: , pí ying xì) or shadow puppetry is an ancient form of storytelling and entertainment using opaque, often articulated figures in front of an illuminated backdrop to create the illusion of moving images. It is popular in various cultures. At present, more than 20 countries are known to have shadow show troupes. Shadow puppetry originated during the Han Dynasty when one of the concubines of Emperor Wu of Han died from an illness. The emperor was devastated, and he summoned his court officers to bring his beloved back to life. The officers made a shape of the concubine using donkey leather. Her joints were animated using 11 separate pieces of the leather, and adorned with painted clothes. Using an oil lamp they made her shadow move, bringing her back to life. Shadow theatre became quite popular as early as the Song Dynasty when holidays were marked by the presentation of many shadow plays. During the Ming Dynasty there were 40 to 50 shadow show troupes in the city