The Structure of the Sixty-four Hexagrams

The sixty-four hexagrams are the heart of the I-Ching. Each hexagram consists of two trigrams (six lines total) and represents a distinct archetypal situation.

【Formation】 Each of the eight trigrams is paired with every other trigram, yielding 8 × 8 = 64 hexagrams. For example, Heaven above Earth forms Pi (Standstill), while Earth above Heaven forms Tai (Peace).

【The Sequence】 The traditional King Wen sequence arranges the hexagrams in pairs according to the principle of "reversal or transformation." When a hexagram cannot be reversed (turned upside down), its lines are all changed to their opposites.

【Upper and Lower Canon】 The 64 hexagrams are divided into two sections: the Upper Canon (hexagrams 1-30) focuses more on cosmic and natural principles, while the Lower Canon (31-64) emphasizes human relationships and social affairs.

【The Final Hexagram】 The I-Ching ends with Wei Ji (Before Completion, hexagram 64), not with Ji Ji (Already Completed, hexagram 63). This is deeply meaningful: nothing ever reaches a final, permanent state. Change is endless.