Yi Jing — The Book of Changes

What Is the Yi Jing?

The Yi Jing (易經), known in the West as the I Ching or Book of Changes, is among the oldest and most influential texts in world literature. Composed over approximately a thousand years — from the late Shang Dynasty through the Warring States period — it serves simultaneously as a divination manual, a philosophical treatise, and a cosmological model of the universe.

The word Yi (易) carries three meanings: change (the constant flux of reality), simplicity (all complexity reduces to yin and yang), and constancy (the laws governing change are themselves unchanging). This triple meaning encapsulates the text's central insight: the universe is a dynamic system governed by discernible, recurring patterns.

Origins and Authorship

Traditional Chinese scholarship attributes the Yi Jing's creation to three sages across three eras:

• Fu Xi (伏羲) — The mythical sage-king who observed patterns in nature and created the eight trigrams (八卦) by stacking broken and solid lines to represent yin and yang.
• King Wen of Zhou (周文王) — While imprisoned by the Shang tyrant King Zhou, he combined the eight trigrams into 64 hexagrams and composed the hexagram judgements (卦辭). His son, the Duke of Zhou (周公), added the individual line texts (爻辭).
• Confucius (孔子) — Tradition credits him with the Ten Wings (十翼), philosophical commentaries that transformed the text from an oracle into a work of cosmological philosophy.

Modern scholarship views the text as a cumulative work shaped by multiple hands over centuries, with the core hexagram texts likely dating to the early Western Zhou period (c. 1000-800 BCE) and the commentaries to the Warring States period (475-221 BCE).

The Eight Trigrams (八卦)

The building blocks of the Yi Jing are the eight trigrams, each composed of three lines (either solid — yang, or broken — yin):

Note: The directions listed follow the Later Heaven sequence (後天八卦) attributed to King Wen, which is used in feng shui and most practical applications. The Earlier Heaven sequence (先天八卦) attributed to Fu Xi follows a different directional arrangement.

The 64 Hexagrams

By stacking two trigrams — a lower (inner) trigram and an upper (outer) trigram — 64 hexagrams are generated. Each hexagram consists of six lines numbered from bottom to top. The lower trigram represents the internal situation; the upper represents the external or future development.

Each hexagram carries:

• A name — e.g., Hexagram 1 Qian (乾, The Creative), Hexagram 2 Kun (坤, The Receptive)
• A judgement (卦辭) — The overall meaning attributed to King Wen
• Line texts (爻辭) — Specific meanings for each of the six positions
• Image commentary (象傳) — A metaphor drawn from nature explaining the hexagram's dynamics

The 64 hexagrams represent every archetypal situation a person or society can encounter — from creative breakthrough (Hexagram 1) to completion and renewal (Hexagram 63 and 64). They are not static symbols but dynamic models of situations in the process of change.

Methods of Divination

The Yarrow Stalk Method (蓍草法) is the oldest and most traditional approach. Using 50 yarrow stalks (one set aside, 49 manipulated), the diviner performs a series of divisions and counts, repeated 18 times to generate six lines. This method produces four possible line types: old yin, young yin, young yang, and old yang — with the "old" lines being changing lines that transform into their opposites.

The Three Coin Method (三錢法) emerged during the Han Dynasty as a simplified alternative. Three coins are tossed six times; heads and tails values are summed to determine each line. While faster, the probability distribution differs from the yarrow stalk method, giving changing lines a higher frequency.

When changing lines appear, a second hexagram is generated showing the situation's direction of transformation. The reading is drawn from both the primary and transformed hexagrams, with the changing lines receiving particular interpretive emphasis.

The Ten Wings (十翼)

The Ten Wings are philosophical commentaries traditionally attributed to Confucius, appended to the core hexagram text. They elevate the Yi Jing from a divination manual to a comprehensive cosmological philosophy:

• Tuan Zhuan (彖傳) — Commentary on the hexagram judgements (2 sections)
• Xiang Zhuan (象傳) — Commentary on the images and individual lines (2 sections)
• Xi Ci Zhuan (繫辭傳) — The "Great Treatise," the most philosophically important commentary, discussing cosmology, the nature of change, and the purpose of divination (2 sections)
• Wen Yan Zhuan (文言傳) — Commentary on the first two hexagrams (Qian and Kun)
• Shuo Gua Zhuan (說卦傳) — Discussion of the trigrams and their attributes
• Xu Gua Zhuan (序卦傳) — Explanation of the hexagram sequence
• Za Gua Zhuan (雜卦傳) — Contrasting hexagram pairs

Philosophical Significance

The Yi Jing's influence on Chinese thought is immeasurable. It established foundational concepts that permeate all Chinese intellectual traditions:

• Yin-Yang (陰陽) — All phenomena arise from the interplay of complementary opposites
• Cyclical change — The universe moves in recurring patterns; decline contains the seed of renewal
• Resonance (感應) — Corresponding elements in different domains of reality respond to each other
• Timely action (時) — Wisdom lies in recognising and harmonising with the present moment's potential

The Yi Jing directly shaped Wu Xing theory, Chinese medicine, feng shui, BaZi, Qi Men Dun Jia, and even Chinese governance philosophy. Leibniz famously saw in its binary structure a precursor to his own binary number system.

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