What is the mystery of the Book of Changes in Lecture Room?

The Book of Changes series of Lecture Room is explained by Ceng Shiqiang, and what is gossip is the fourth episode.

The details are as follows: Eight natural phenomena on the earth are represented by gossip. Ceng Shiqiang explained in detail why the sky is called dry, the earth is called Kun, the water is called Kan, the fire is called separation, the thunder is called shock, the wind is called training, the mountain is called Gen, and Ze is called Jiao. Eight diagrams are born according to the changes of yin and yang of the four elephants. Ceng Shiqiang suggested that to understand the Book of Changes, we must be good at using our imagination. He also pointed out that gossip is a very beautiful and neat symbol system, and we must actively use our imagination to understand gossip.