Eight numbers correspond to gossip.

The four images correspond to the five elements of wood fire, gold and water, wood is shaoyang, fire is the sun, gold is shaoyin, and water is Taiyin. The four corners of the earth are composed of four elephants, which are mixed with wood, fire and gold, corresponding to the four directions of southeast and northwest, and the intersection of the four directions is the earth and the center.

This shows that gossip and five elements are both yin and yang.

The number 1~9 is called "yin and yang two instruments, three-inch three-body, four points and four elephants, five elements and five zang organs, six rivers, seven stars, eight diagrams and nine palaces" in the Book of Changes. Eight diagrams represent eight basic images: dry for the sky, Kun for the earth, earthquake for thunder, sorrow for the wind, Geng for the mountain, change for ze, ridge for water, and separation for fire, all of which are called classics. Arrange two of the eight classics into a group to form sixty-four hexagrams. These eight basic symbols also correspond to numbers, 1, 2, 3, 4, 5, 6, 7, 8. There is no number like 9. In the Yi-ology theory, 9 is not a specific number, but a symbol to distinguish the yin and yang attributes of numbers.

The five elements refer to the laws of material movement and birth, and Jin Mu is the ancestor of all things in the world. The numbers corresponding to the five elements are 1, 2 is wood, 3 and 4 are fire, 5 and 6 are earth, 7 and 8 are gold, and 9 and 0 are water. The five elements are further divided into yin and yang, 1, 3, 5, 7, 9 is yang, 2, 4, 6, 8, 0 is yin, and there is a number *** 10, which is a natural number. The characteristic meaning of each number is almost consistent with Greek mathematics.