Human understanding of chaos has gone through a long process from vagueness to clearness, and from perception to science. In ancient China, “chaos” was used to describe the indistinct state of the universe before heaven and earth were separated. The first sentence of “Journey to the West” reflects the ancient understanding of “chaos”: “Before chaos was divided, heaven and earth were in disarray, vast and indistinct, unseen by anyone.” According to Xu Zheng’s “Three Five Calendar” from the Eastern Wu period during the Three Kingdoms era, today’s “heaven” and “earth” were opened from a chaotic state by a deity named Pangu, which is the origin of the legend of “Pangu separated the heaven and the earth.”