What is the main content of "copulative"

In "copulative", first of all"The I ching"The basic principle of creative and play.It has some ideas of Yin and Yang of ancient China, developed into a system view of the world, and the unity of opposites of Yin and Yang, heaven and earth, and soft to explain the universe and all the changes of human society, think the parity number, Yin and Yang are two hexagram, qiankun two terms, eight hexagrams, and sixty-four, are composed of Yin and Yang, without of opposites, there is no the zhouyi.It also highlights the universe, the nature of living by, affirmed the significance of the change, unyielding, advocate to finish by change.Second, it with "bao tai" as the highest ideal, inherited the traditional Chinese culture attaches great importance to the harmonious thought, and the process of divination by the theoretical, contains the theory of the universe, a great deal of influence on the later thinkers.