What are these four stages?

In the traditional culture of China, the four phases refer to Qinglong, Baihu, Suzaku and Xuanwu, which represent left and right, left and right or east, west, north and south respectively.

Qinglong, also known as Black Dragon and Meng Zhang, is an image in ancient myths and legends of China, and is one of the "Four Spirits", corresponding to the "Seven Hostels in the East" in the "Four Elephants". The origin of Qinglong is related to natural phenomena, mainly from ancient people's understanding of the operation of stars and farming culture.

The White Tiger is one of the four gods in ancient China mythology, the God of the West, and later believed by Taoism. Together with Qinglong, Suzaku and Xuanwu, they are called the Four Gods. According to "Zhongxing Zhengxiang", the white tiger was covered with snow and hairless.

Suzaku is one of the four spirits in ancient China mythology, which originated from the worship of stars in ancient times. It is a southern god who represents Emperor Yan and the seven nights in the south. It separates from the gossip and lights the fire of the five elements, symbolizing Lao Yang in the four elephants, summer in the four seasons and the southern heaven.

Xuanwu, one of the four celestial spirits in ancient China mythology, also known as tortoise and snake, originated from the worship of stars in ancient times, which means that Xuanwu in the north divided twenty-eight lodges into seven lodges according to the southeast and northwest. Xuanwu is a spiritual thing composed of turtles and snakes.