Yin and Yang

More explanation of Yin and Yang

Reality, the ancient Chinese concluded, is full of polarities such as day and night, bitter and sweet, winter and summer, male and female. They called this natural harmony of opposites yin and yang. That is why everything, including meals (we notice this in Chinese cooking) should be in conformity with this bipolarity, balancing sour and sweet, peppery and bland. This reality of which we are born, with its yin and yang, is a reality in which everything and everybody are made of the same material. They call this material ch'i. Ch'i is the basic reality of all that is, including the rocks, the lilies, and us! - Daniel C. Maguire

The concept of Yin-Yang is essentially simple, yet its influence on Chinese culture has been extensive. There is no aspect of Chinese civilization – including philosophy, medicine, sexology, politics, government, literature, and art – that has not been touched by this simple, powerful idea. According to Yin-Yang philosophy, all objects and events are the products of two elements, forces, or principles: Yin, which is negative, passive, weak, and destructive, and Yang, which is positive, active, strong, and constructive. It is quite possible that the two sexes, whether conceived in terms of female and male essences, the different social roles of women and men, or the structural differences between female and male sex organs, are not only the most obvious results of the workings of Yin and Yang forces, but major sources from which the ancient Chinese derived these concepts as well. - Fang Fu Ruan