What do I mean by the Book of Changes, two instruments and four images?

Yin and Yang are two musical instruments, also called poles. According to Taoism, clarity is the lightness of yang, turbidity is the heaviness of yin, and the four phenomena refer to four weather phenomena: wind, rain, thunder and electricity.

This is the explanation of our country's simple materialism, explaining the change of natural climate.

Of course, it is euphemistic and can be explained in any way, so it is used for fortune telling.