What do the five colors in the five elements mean?

Oriental, wood, cyan, number eight, with spring.

South, fire, red, count to seven, with summer.

Western, golden, white, count to nine, with autumn.

North, water, black, counting, winter.

This thought can be found in the first 12 volumes of Lu Chunqiu, and as early as the Warring States Period, Zou Yan's theory of "five virtues beginning at the end" included "wood green", "fiery red", "golden white" and "water black".

If the theory of Yi Tong Tong Map is painted on the ground or in the sand table, it is a popular picture of spring, long summer, autumn harvest and winter storage. It is also a "map" of five elements, numbers, directions and colors.

Therefore, it is called "Yitong unified map", which means that "earthquake is wood" matches the east; "Kans are water" with the north; "Away from the Fire" with the South; "Exchange for gold" with the West is the orientation map of the four positive hexagrams in Yi Legend hexagrams and Emperor Zhen Tu. This is a simple divination map of Qi Yi's early days.