The world view that underlies the I Ching is rooted in Daoism (Chinese: “Teaching the Way”, Taoism). The basic idea is the primordial unity from which all creation emanates: it gives birth to duality (Yin and Yang, light and shadow) and by their changes, movements and interplay creates our environment (the external world).
The ethical teachings of Daoism advise that people should learn about this basic principle through their own observation and realize the Dao by harmoniously adapting to the continuously changing, phenomenal forms.
Daoism is a philosophy, but it is also seen as China’s sole and authentic religion. Its secured historical origins are in the 4th Century BC, when the Daodejing (Tao Te Ching, Tao te Ching) of Laozi (Lao Tzu, Lao-tzu) was created.
Read more: http://en.wikipedia.org/wiki/Taoism