Many natural dualities ~ dark and light, female and male, low and high – are cast in Chinese thought as yin yang.
According to the philosophy, yin and yang are complementary opposites within a greater whole. Everything has both yin and yang aspects, which constantly interact, never existing in absolute stasis
Yin yang are opposing
Yin yang describe opposing qualities in phenomena. For instance, winter is yin to summer’s yang over the course of a year, and femininity is yin to masculinity’s yang in human relationships. It is impossible to talk about yin or yang without some reference to the opposite.