The so-called Tao gives birth to one, two, three and three things; That is, infinity gives birth to Tai Chi, Tai Chi gives birth to two instruments, and Yin and Yang combine to give birth to everything.
The universe is infinite, so it is called Tai Chi, but the universe is tangible, that is, it has substantial content. According to the viewpoint of Yi-ology, tangible things come from the intangible, so they are infinite, which is Tai Chi. Taiji is a dynamic entity, that is, the universe is moving. When it moves to a certain extent, it becomes relatively static, and when it is static, it produces Yin. So when it moves and stands still, Yin and Yang are the root of each other and run in infinity.
The same is true of nature. The growth set of yin and yang in the four seasons of cold and summer, that is, the growth law of everything, includes yin and yang and five elements. As far as yin and yang are concerned, "the avenue becomes a man, and Kun Dao becomes a woman." Yin and yang are combined, and everything is born. Everything is born according to this law, so it changes endlessly. These contents put forward three schemes, namely, the way of establishing heaven, the way of standing on the ground and the way of educating people, that is, the way of three talents, which is the so-called "six moves and three poles." Compared with the eight diagrams, Taiji diagram appeared later. The eight diagrams symbol appeared before the Zhou Dynasty, and it is said that it was written by Fu in ancient times, and the word "Tai Chi" first appeared in the Book of Changes: "Yi has Tai Chi, and there are two instruments, and the two instruments give birth to four images, and the four images give birth to eight diagrams, and the eight diagrams determine good and bad luck, and good and bad luck gives birth to great cause." What is Tai Chi? "Too" means "knowledge"; "Extreme" means "limit"; "Taiji" refers to the limit, which refers to the initial form of Yin and Yang in the evolution stage of the universe. Therefore, strictly speaking, the Taiji diagram in which the fish of Yin and Yang turn around and embrace each other is not a diagram used to express the image of Taiji, but its original name is "Natural Diagram of Heaven and Earth" (showing the natural flow of Yin and Yang). To express the image of Tai Chi, an empty gray circle seems to be enough.
Hang Xinzhai (1869- 1923) wrote in the Book of Changes: "Zhao? Qian's "Six Books Original Meaning" said: "Heaven and earth create a picture, Fu Longma belongs to Xinghe, and the eight diagrams are based on paintings. Cai Ji, handed down from ancient times, lived in seclusion in Shu, but kept it a secret. Zhao is from Chen Bofu's family. He is familiar with Tai Chi's Yin-Yang belief and Yin-Yang belief in gossip. Since the Ming Dynasty, this painting has been widely circulated all over the world. (Press: This photo was taken before Cai died in his later years, so Zhu didn't see it either. After Cai's death, he hid in his home and passed it on to Sun and Song. Hu Yuan's generation is still relatively rare. At the beginning of the Ming Dynasty, Liu Qingtian took it and painted it as gossip, so it became popular all over the country and became a household name. Zhu Zifa () said,' Chen Tuan planted seeds with' congenital map' and passed them to Shao Yong in three times'. So Kang Jie's knowledge comes from Yi Xi. The performance of "Congenital Map" and the ups and downs of Yin and Yang also coincide with this map, so it is also called "Taiji True Map". Tai Chi is in the ring, and both sides are black and white. White is yang and black is yin. The north is full of yin and the sun is thin, so the youngest son said,' Yin turned to Yang at the beginning of the earthquake'. Since the earthquake, I have left and exchanged so much. I am doing it, while Yang Si is prosperous. Northeast earthquake, white one, black two, is a strange couple. Against the southeast, white is divided into two points, and black is divided into one point, which is two odd and one even. Dry south and all white are for three unique and pure yang. Taking the black spots in the west white from the east is two odd and one even, so the cloud is' middle'. Yang is abundant in the south, and Yin is welcome in the south. So Shao Zi said,' Yang disappears at the beginning, but Yin lives'. I'm embarrassed, I'm embarrassed. I'm Kun, and Yin is full of enthusiasm. Southwest of Xun, one point is black and two points is white, which is even and odd. Gen northwest, black dichotomy, white dichotomy, change two even numbers and an odd number. Kun is all black in the north, because it is pure yin for three couples. Because of the west, the east is black and the middle is white, which means that two pairs contain a strange, so the cloud is' opposite to the yang and middle'. Li Kan is the sun and the moon, rising and falling between Gan and Kun, without positioning. Na Jia sent Wu Ji in the palace, so the affairs between things are different from those of Liu Yi. The parity of three paintings in eight directions corresponds to the quality of white and black, which is wonderful for Yin and Yang. However, yin and yang are black and white, which is not the truth of Tai Chi, nor is it properly called Tai Chi Diagram. Now northerners call this painting' Yin and Yang Fish', but the word' fish' is actually a mistake in the word' vessel'. Call it' Yin-Yang Instrument Diagram' or' Two Instrument Diagram', which is worthy of the name. "
Because the Taiji diagram in which Yin and Yang fish turn around and embrace each other was drawn by an ancient hermit, the drawing principle and significance of the original diagram have been lost, so the naming and interpretation of Taiji diagram is understood by later generations according to the diagram, which is not completely reliable. As mentioned by Shao Yong and Hang Xinzhai above, the most obvious point is that all the gossip symbols around Taiji Bagua correspond to eight equal sectors, and the ratio of Yin and Yang in the gossip can meet the ratio of Yin and Yang in the corresponding sectors. Taiji map corresponds to the sectors of Kangua and Ligua, which can be understood as "from the east, rising day by day, and the inner hexagram means that the yang begins to grow and the yin begins to disappear, so there is yang in the yin, which is the yang hexagram. The ridge is westward, and gradually inclines westward. The yin in the inner stomach begins to grow and the yang begins to disappear. Therefore, there is yin in the yang, which is yin. "
In 1980s and 1990s, based on the comprehensive system theory (structural theory), Ceng Bangzhe put forward that "Taiji diagram is a synthesis of vitality, yin and yang changes, six-hexagram organization and Taoist concepts", which is regarded as a unique schema logic system with the same isomorphic mathematical model in China culture, involving cosmology, evolution, constructivism and the patterned logical thinking of Taoist concepts.