In the Taoist view of Yin and Yang, Yin and Yang are the relationship of unity of opposites. Yin is feminine, negative and introverted, representing symbols such as sky, woman and moon; Yang is masculine, positive and extroverted, representing the sun, men and sunshine. Man himself is a combination of yin and yang. Therefore, Taoism believes that balancing the relationship between Yin and Yang contributes to physical and mental health and the harmonious development of the world.
Taoist concept of Yin and Yang is not only widely used in philosophy, but also extended to many fields, such as medicine, agriculture and engineering. In the theory of traditional Chinese medicine, human health is closely related to yin and yang, and the theory of 24 solar terms and five elements of traditional Chinese medicine is also based on the concept of yin and yang. In agriculture, the concept of yin and yang also has important applications, such as the cultivation and fertilization of different plants in different seasons or climates; In engineering, the construction time and orientation should also be arranged according to the criteria of yin and yang to achieve the best effect.