Where is the ancient colorful fish tank in China?

In the coat. China's ancient color tricks have a long history. Since the Southern Song Dynasty, there have been performances in Washe, Jiexiang and Jubilance Hall in Hangzhou. Magic follows tradition. There is a fish tank hidden in the robe. Take it out instantly during the performance. The fish tank contains water and goldfish, which requires the performer's proficiency in tricks. It is a trick with high technical content.