What is a nine-hole musical instrument?

Nine-hole instrument is an ancient folk fortune-telling method in China, which can be used to predict a person's fate and what will happen in the future journey.

The history of Nine Cave Instruments can be traced back to the Spring and Autumn Period and the Warring States Period. It is a fortune-telling method based on gossip, which can help people better understand their own destiny and provide guidance for the future.