The text consists of 64 hexagrams—six-line figures composed of broken (yin) and unbroken (yang) lines. Each hexagram represents a particular situation or state of change, accompanied by judgments and commentaries offering guidance.
Traditionally, one consults the I Ching by generating a hexagram through random process (originally yarrow stalks, later coins). The resulting hexagram and its changing lines provide insight into one's situation and potential developments. However, the text can also be studied philosophically apart from divination.
The I Ching's fundamental premise is that reality consists of constant transformation following intelligible patterns. Understanding these patterns enables wise action. Change is neither random nor rigidly determined but unfolds according to principles that can be grasped and harmonized with.
Confucian commentaries emphasize ethical guidance; Taoist interpretations stress naturalness and non-interference. Western reception ranged from dismissal as superstition to serious engagement by Jung and others who found profound psychological and philosophical insights in its symbolic system.
Source
I Ching - Various authors and commentators