"Five Grains" is spoken in the Spring and Autumn Period and the Warring States Period. "The Analects of Confucius": "The four bodies are not diligent, and the grains are not divided." But there are different explanations. One is millet, millet, wheat and rice. Speaking of millet, millet, wheat, millet, marijuana. The main difference between these two statements is whether there is rice or hemp. The reason for the inconsistency was that there were more than five kinds of crops at that time, as evidenced by the existence of the theory of "100 grains", "6 grains" and "9 grains", and the varieties of crops were different from place to place. The popularity of the theory of "five grains" is obviously caused by the influence of five elements. Therefore, generally speaking, grain refers to several major food crops.
Grain culture plays an important role and can be described as the origin of human civilization. According to authoritative data, hundreds of thousands of years ago, humans have observed traces of sorghum on stone tools, indicating that grains have been pregnant with humans for more than 100 thousand years. It is a feat in human history to cultivate weeds into coarse grains, which gave birth to human civilization. At the same time, it tells the world that human beings have an indissoluble bond with grains. Grain painting is the highest artistic embodiment and portrayal of grain culture.