In Chinese culture, Yin and Yang represent the two opposite principles in nature. Yin characterizes the feminine or negative nature of things and yang stands for the masculine or positive side. Yin and yang are in pairs, such as the moon and the sun, female and male, dark and bright, cold and hot, passive and active, etc. But yin and yang are not static or just two separated things. The nature of yinyang lies in interchange and interplay of the two components. The alternation of day and night is an example.