The Yijing is organized as a set of 64 unique figures, each composed of six stacked lines (yao). These lines can either be solid (Yang) or yielding (Yin). Each hexagram is formed by combining two trigrams, which are the upper and lower groups of three lines. The hexagrams represent various situations, transformations and states in life.
Trigrams:
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The core text of the Yijing: The Changes of Zhōu, written circa 800BC.