In the Book of Changes 1-6 is water, 2 17 is fire, 3 18 is wood, 4 19 is gold, and 5-0 is earth. The five elements are further divided into yin and yang. 1, 3, 5, 7 and 9 are yang, 2, 4, 6, 8 and 0 are yin, and the number 1 is yang wood, which can be compared to towering trees. This tree is tall and strong, fearless of wind and rain, which means it is the pillar of indomitable spirit. The number 2 is shade wood, shade wood is a big tree, shade wood is grass and flowers.
Yin and yang gossip
Yin-yang two instruments, three-inch three-body, four points and four elephants, five elements and five internal organs, six rivers and seven stars, eight diagrams and nine palaces. 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. In the Book of Changes, contrary to 9, 12 stands for Yin, which was considered as the most auspicious number in ancient times.