The concept of yin and yang originates from the ancient Chinese view of nature. The ancients observed various opposing and interrelated natural phenomena in nature, such as heaven and earth, sun and moon, day and night, cold and heat, men and women, up and down, etc., and summarized the concept of "yin and yang" in a philosophical way of thinking. As early as the Spring and Autumn Period, Yi Chuan and Lao Tzu's Tao Te Ching both mention yin and yang. The theory of yin and yang has permeated all aspects of traditional Chinese culture, including religion, philosophy, calendar, traditional Chinese medicine, calligraphy, architecture, divination, etc. Yin and Yang is a division or subdivision of "the unity of opposites or contradictory relations", and the two are species. The foundation of the five elements of yin and yang seems simple, but there are very few people who know it, and even fewer people who know it and can keep it.

Yin, the ancient work of "侌", or the addition of "阜" representing virtual entities as "Yin"; Yang, the ancient work "昜", or add the "阜" that represents the virtual entity as "yang". From now on, the word "侌" means "the mist that is rotating and reuniting". "昜" means "divergent gas". It can be seen that the ancients defined "yin and yang" from the two perspectives of the essence of the material world, "gas" and the "movement" of gas. The ancients did not call it "yang yin" but "yin and yang".

Yin, "Shuowen Jiezi" said: "Dark, the south of the water, the north of the mountain", and the "Biography of the Shuowen Department" said: "The north of the mountain and the south of the water, the sun is beyond reach". Case: This is a macro perspective of heaven and earth, yin and yang. Heaven and earth are the largest yin-yang entities known to ancient humans. From the perspective of the largest yin and yang entities, the nature of yin and yang is discussed, and the meaning of the big yin and yang encompasses all the small yin and yang, which is also a clever move.

Yang, "Shuo Wen Jie Zi" said: "Gao Ming also." "Saying the Text Interprets the Meaning of the Word": "Gao Ming is also, and Yin Yan is also." "Case: The highest, the heavens; The bright, the sun. This is still from the macro perspective of heaven and earth, yin and yang.

"Tao Te Ching" says: "Tao gives birth to one, life to two, two to three, and three to all things." All things are negative yin and embrace yang, and they are impulsive and think they are harmonious". Case: This is talking about yin and yang from the perspective of the origin of the universe, but it is not a definition or explanation of the word "yin and yang" itself. The Taoist, the guide. Guide, Xiang also. When chaotic water vapor shifts from disorderly motion to orderly motion, it is equivalent to the vehicle is on the right path and begins to move towards its destination. This orderly movement on the right path led to the birth of Tai Chi. Tai Chi is "one", which was born at the moment when chaos shifted from disorderly movement to orderly movement. As soon as Tai Chi was born, it was followed by the emergence of heaven and earth. Heaven and earth are "two". The weather falls, the earth vapors, and the two qi merge, and the result is the birth of man. People are "three". "Three" also includes all living beings, and human beings are the most spiritual of all living beings and are their general representatives. Subsequently, all things in the world alternate from generation to generation in the interaction of yin and yang, maintaining the balance of population and quantity. "Negative yin and embrace yang" indicates that "yin" is the basis or premise of "yang".