What Is the I-Ching? — The Classic of Changes

The I-Ching, also known as the Book of Changes, is one of the oldest and most important texts in world literature. Its origins stretch back over three thousand years to the Shang and Zhou dynasties.

【Origins】 Legend holds that Fu Xi, a mythical sage-king, created the eight trigrams by observing patterns in nature. King Wen of Zhou, while imprisoned, expanded these into the sixty-four hexagrams and wrote the judgment texts. His son, the Duke of Zhou, added the line texts. Confucius and his disciples later composed the Ten Wings, commentaries that transformed the I-Ching from a divination manual into a philosophical masterpiece.

【Core Structure】 The I-Ching has two parts: - The Classic: 64 hexagrams, each made of six lines (yang ⚊ or yin ⚋), with judgment texts and line texts. - The Commentaries: Ten Wings that explain the philosophy behind the hexagrams.

【Key Concepts】 - Yin and Yang: The fundamental duality of the universe. All change arises from their interplay. - The Eight Trigrams: Heaven (☰), Earth (☷), Thunder (☳), Wind (☴), Water (☵), Fire (☲), Mountain (☶), Lake (☱). - The Sixty-four Hexagrams: formed by combining two trigrams, each represents a life situation.

【Modern Relevance】 The I-Ching has influenced not only Chinese philosophy but also modern fields like systems theory, decision science, and even computer science (Leibniz saw binary numbers in the hexagrams). Its core teaching — that change is the only constant — resonates across cultures and centuries.