Philosophy
Gradations of binary expression based on yin and yang -- old yang, old yin, young yang or young yin (see the divination paragraph below) -- are what the hexagrams are built from. Yin and yang, while common expressions associated with many schools known from classical Chinese culture, are especially associated with the Taoists.
Another view holds that the I Ching is primarily a Confucianist ethical or philosophical document. This view is based upon the following:
The Wings or Appendices are attributed to Confucius.
The study of the I Ching was required as part of the Civil Service Exams. These exams only studied Confucianist texts.
It is one of the Five Confucian Classics.
It does not appear in any surviving editions of the Dao Zheng.
The major commentaries were written by Confucianists, or Neo-Confucianists.
Both views may be seen to show that the I Ching was at the heart of Chinese thought, serving as a common ground for the Confucian and Taoist schools. Partly forgotten due to the rise of Chinese Buddhism during the Tang dynasty, the I Ching returned to the attention of scholars during the Song dynasty. This was concomitant with the reassessment of Confucianism by Confucians in the light of Taoist and Buddhist metaphysics, and is known in the West as Neo-Confucianism. The book, unquestionably an ancient Chinese scripture, helped Song Confucian thinkers to synthesize Buddhist and Taoist cosmologies with Confucian and Mencian ethics. The end product was a new cosmogony that could be linked to the so-called "lost Tao" of Confucius and Mencius.
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