What do you mean by changing bottles?

It means traditional handicraft skills in China.

Pier-pier bottle mixing is a traditional handicraft skill in China, which is mainly used for bottle making and pottery making. This technology is usually done by professional craftsmen. Through manual operation and special tools, clay is slowly kneaded into the required shape, and then it is finally turned into a molded bottle or pottery through firing and other processes.

Mixing bottles on piers is not only a technique, but also an artistic expression. Every bottle produced has the unique style and creativity of the craftsman. This traditional handicraft has a long history in China, and it is also an important part of China cultural tradition.