What do you mean by snake wrapped around turtle?

The snake-wrapped turtle is Xuanwu. The moral is to invite the tortoise to the underworld to ask questions, bring back the answers and show them to the world in the form of divination.

Xuanwu is one of the four spirits. Xuanwu, like other three souls, is also transformed from 28 stars on earth. The ancients explained Xuanwu like this. Xuanwu' is a tortoise. . Volume 44 of Emperor Tai Shang Ru Zhai Yi calls North Xuanwu Star Jun: "Dou Su Tian Miao Xing Jun, Niu Su Tian Ji Xing Jun, Female Su Tian Nv Jun, Xu Su Tian Qing Xing Jun, Su Su Tian Qian Xing Jun, Su Su Su Tian Qi Xing Jun, Su Bi Shi Tianxing Jun". As for its image, Jiao Tong's Essentials of Daomen has seven clouds: "North Xuanwu, Taiyin Metaplasia, and Virtual Danger. At the same time, Taoism also uses it in alchemy. For example, Volume 72 of Yun Qi Tanabata quoted the Dan of the Four Gods in ancient books and said, "Xuanwu is the black mercury in northern China, which can be soft and firm." "Jing" says: goodness is like water. Non-lead, non-tin, non-stone and the like, water is Hedong Shenshui, born before heaven and earth, so medicine can't be abandoned temporarily, and it can support everything, so it is called Xuanwu. The value of Xuanwu was promoted and personified in the Song Dynasty, which was inseparable from the help of the emperors in the Song Dynasty. In the early Song Dynasty, Zhenwu and Tian Peng were legendary generals in heaven. In the first year of Tianxi, something happened in the military camp. In "The Original" for seven years:' Someone saw a snake in the camp, and the sergeant built a real martial arts school because of it. In April of the following year, the spring was inexhaustible, and the sick people drank more. When Zhenzong heard this, he wrote a letter and built a landscape there, named it' Xiangyuan'. This is probably the earliest Zhenwu Temple in China.