Yellow, in China culture, refers to the place where people live after death. In ancient times, it was thought that heaven and earth were mysterious and springs were underground, so it was called yellow.
Blue sky: Taoism says that the first floor of the East Building is full of blue sky, which is called "blue sky". Later it generally refers to the sky (sky).
Forgotten Sichuan is a river in the underworld. According to legend, in the forgotten depths of Sichuan, there lived an old man with a beard-a fairy who supervised human reincarnation. After forgetting Sichuan, the dead soul can return to the world and get a new life. Of course, they want to drink the forgotten spring water in Sichuan and forget all the joys and sorrows in their previous lives. Everything was once a thing of the past.
Santuchuan, also known as "Santuhe". According to legend, "Three Rivers" is the dividing line between life and death. Because the water flow can be divided into three types according to the behavior of the deceased before his death, it is called "three roads"
Mengpo Tangnaihe Bridge is familiar to everyone, not to mention.
These places all refer to national subjugation (also known as the underworld).