In ancient China, numbers were divided into positive numbers and negative numbers, odd numbers were positive and even numbers were negative. Nine is the highest yang number, with five in the middle, so "nine" and "five" symbolize the authority of the emperor and are called "the respect of the Ninth Five-Year Plan".
The acquired stage is based on the five elements. After the great development of human education, the number of "Ninth Five-Year Plan" has developed from teaching students, establishing etiquette and laws;
Five spirits-heaven, earth, man, god and ghost.
Five elements-wood, fire, earth, gold and water.
Five directions-east, south, middle, west and north.
Five colors-green, red, yellow, white and black.
Five seasons-spring, summer, four seasons, autumn and winter.
Grains-rice, millet, millet, wheat, glutinous rice.
Five flavors-sour, bitter, sweet, spicy and salty.
Five qi-wind, heat, wet, dry and cold.
Five tones-Jiao, Qian, Gong, Shang and Yu.
The so-called "Ninth Five-Year Plan" covers the whole world and is full of red dust. Whoever does not "jump out of the three realms and not be in the five elements" will be bound by the Ninth Five-Year Plan.