The ancient Chinese subscribe to a concept called Yin Yang which is a belief that there exist two complementary forces in the universe. One is Yang which represents everything positive or masculine and the other is Yin which is characterized as negative or feminine. One is not better than the other. Instead they are both necessary and a balance of both is highly desirable.
This thinking is different from the duality of most religion where one state overcomes the other e.g. good over evil. In the concept of Yin Yang, too much of either one is bad. The ideal is a balance of both. The hot Saharan desert for example is an example of extreme Yang while the bitter cold
The Yin Yang meaning is embodied by the Tai Chi symbol shown on the left. It is a circle made up of two different tadpole or fish like parts, one in black (known as the Yin side) and the other in white (known as the Yang side). You will notice that in Yang (represented by the white tadpole) lies the seed of Yin (represented by the black dot) and vice-versa. In addition Yin and Yang are cyclical. In the symbol you can see that Yang grows but at its height, Yin emerge. Then Yin grows and at its height Yang appears and the cycle repeats itself. Actually another way to look at Yin and Yang is contraction and expansion!
Yin is soft while Yang is hard. Yin is stillness while Yang is movement. The sun is yang while the moon is yin. Female is Yin while Man is Yang. Mountain is Yin while the river is Yang. Intuitive is Yin while Logical is Yang. Winter is Yin while Summer is Yang and so on.