I King or "Book of Changes" is one of the oldest classic text ever arrived.
The ideogram "I" represents a Chameleon while "King" means "Classic" (referred to a text).
The book, in ancient times, was only a combination of simple horizontal lines, either unbroken or broken, Yang and Yin. These lines were divided into set of six; the possible arrangements were represented by sixty-four "HEXAGRAMS".
Traditionally the principles of I King originated with Fu Hsi (3000 a.C.). But a long time after a progenitor of the Chou dynasty, King Uenn, while prisoner of the tyrant Ciou Shin, added short sentences to the chaotic signs. Afterwards, his son, "The Duke of Chou", enriched the single lines with a text. Confucius, later, completed the work and wrote a commentary on each hexagram.
I King was the heart of the Ancient thoughts; they used to live in touch with nature and from nature they took out images that nowadays are hardly comprehensible.
Although I King is an "unopened" book, its application in Martial Arts in general and, specifically, in the Kung Fu of Master Chang, is essential not only for the moral principles included but also for the physical practice: look at the five Shaolin diagrams related to the diagram so called by "Fu Hsi" or to the 108 techniques of Tai Chi connected to the 64 hexagrams