What Is the I Ching?

If asked to name one book that holds the long wisdom of the East in a single volume, many would think of the I Ching. It is commonly known as a book of divination, yet its root reaches a deep insight: that all things change ceaselessly. That is why it is usually rendered in English as The Book of Changes. Before it is a tool for foretelling fortune, it is a classic of wisdom that reads the principle of change and tells how to carry oneself within its flow.

The Legend of Fuxi and What the Manuscripts Actually Show

By legend, the ancient sage Fuxi observed nature and drew the eight trigrams; King Wen of Zhou later attached the hexagram statements, and the Duke of Zhou the line statements. That lineage, however, is closer to how later ages lent authority to a classic than to a documented history. The physical evidence tells a more cautious story. The Zuo Zhuan records more than twenty consultations of the Zhouyi performed for noble houses between 671 and 487 BCE, each with its circumstances spelled out — proof that the book was in working use by the Spring and Autumn period at the latest.

The earliest copy so far identified is a set of Warring States Chu bamboo slips that surfaced on the Hong Kong antiquities market in 1994 and was acquired by the Shanghai Museum; it dates to roughly 300 BCE. A silk manuscript from Mawangdui came out of a tomb sealed in 168 BCE, and strikingly, its sequence of the sixty-four hexagrams differs from the order we use today. The book was not fixed in a single form from the start. The Zhou Li names three separate Changes traditions — the Lianshan of Xia, the Guicang of Shang, and the Zhouyi of Zhou. The Guicang, known for two millennia only by quotation, partly resurfaced in 1993 as bamboo slips in a third-century BCE tomb at Wangjiatai; the Lianshan remains lost.

From Line to Hexagram: How the Signs Are Built

The smallest unit is the line, of two kinds, marking yin and yang. A broken line is yin, an unbroken line is yang. Three lines stacked make a trigram; six make one of two-to-the-sixth, that is, sixty-four hexagrams. Each trigram answers to a great force of nature — heaven, earth, water, fire, wind, thunder, mountain, lake — and one trigram set above another forms a full hexagram.

There is design in the order they are placed. The traditional King Wen sequence groups the sixty-four into thirty-two pairs. Twenty-eight of those pairs are formed by inversion: turn a hexagram upside down and you get its partner. The remaining eight hexagrams look identical when inverted, so they pair instead by complementation, every line flipped — hexagrams 1 and 2, 27 and 28, 29 and 30, 61 and 62. Each hexagram shows the whole picture of a situation through its six lines, while the changing lines within point to how that situation will move next. So the I Ching is less a still scene than a moving image, flowing from now into the next.

Yarrow Stalks and Coins: The Same Book, Different Odds

Traditionally a hexagram was cast with fifty yarrow stalks. One is set aside to stand for the undivided origin and forty-nine are used. Dividing them and removing groups of four in a four-step operation, repeated three times, settles a single line; six lines require eighteen operations in all. The three-coin method, widespread from about the ninth century CE, is far quicker: toss three coins, count the yang face as 3 and the yin face as 2, and the total is 6, 7, 8 or 9 — which fixes the character of the line.

The two methods produce answers of a different texture, and the numbers make the difference plain.

With yarrow, a changing yang line is exactly three times more likely than a changing yin line. The older procedure treated the moment when yin reaches its extreme and turns as a genuinely rare event; the coins erase that asymmetry and make yin and yang symmetric. Neither is more correct, but it is honest to know that changing the instrument changes the distribution of the answers. Online oracles using random numbers almost always follow the coin distribution. The full calculation is set out here.

The Classic, the Commentaries, and Two Schools of Reading

The book divides into the classic proper — the hexagram and line statements — and the Ten Wings, ten appended commentaries. Tradition credits the Wings to Confucius, but most scholars today read them as material assembled by many hands between the Warring States period and the early Han. The evidence for single authorship is thin.

Interpretation likewise split in two. Han-era learning developed the xiangshu approach, minutely tracking the images and numbers of the hexagrams. Then Wang Bi (226–249), who died at twenty-three, wrote the Zhouyi zhu, sweeping away that elaborate apparatus and opening the yili path of reading for meaning and principle. In the Song, Cheng Yi's Yichuan yizhuan read the book as moral and political philosophy, while Zhu Xi, in the Zhouyi benyi, insisted it had originally been a divination manual and separated the classic from the commentaries again. Faced with the same hexagram, the question was which came first: what it means, or how the sign was produced. That tension is still alive whenever you choose an I Ching edition today (overview at the Stanford Encyclopedia).

Korea's I Ching, and Three Common Misconceptions

No account of the Korean tradition can skip Jeong Yak-yong's Juyeok sajeon (Four Commentaries on the Zhou Changes). Writing in exile, he revised it through drafts of 1805, 1806 and 1807 before completing the twenty-four-volume version of 1808, building four interpretive methods — chuui (shifting), mulsang (imagery), hoche (nuclear trigrams) and hyobyeon (line change) — to read hexagram and line statements consistently. Four rewrites in three years say something about how he regarded the task.

The first misconception is that Tojeong-bigyeol, the Korean almanac of yearly fortune, descends directly from the sixty-four hexagrams. It actually builds its sign from three remainders — age and year-stem divided by 8, birth month and month-stem by 6, birth day and day-stem by 3 — giving 8 × 6 × 3, that is 144 configurations. It borrows ideas such as nuclear and complementary hexagrams, but its numerical frame is its own; it is better described as a separate system informed by the I Ching than as its offspring.

The second is that the book anticipated binary arithmetic or the genetic code. The Jesuit Joachim Bouvet did write from Beijing on 4 November 1701, his letter reaching Leibniz on 1 April 1703, and Leibniz that year published his explanation of binary arithmetic before the Paris Academy, citing Fuxi's diagram. But Leibniz welcomed the diagram as confirmation of a system he had already worked out, and the arrangement he saw was not the King Wen order but the "prior heaven" sequence organized by Shao Yong in the eleventh century. The match between 64 hexagrams and 64 DNA codons is likewise arithmetic coincidence — two to the sixth and four to the third are the same number — not ancient foreknowledge.

The third is that a hexagram announces a fixed future. Read the divination episodes in the Zuo Zhuan and you repeatedly find diviners declaring that a favorable sign would not hold for a man lacking virtue. The hexagram was treated as material for argument, not as a verdict.

Reading the I Ching Today

The book reached the West in earnest through the missionary Richard Wilhelm, who translated it into German in 1924, and Cary Baynes, whose English rendering appeared from Pantheon in two volumes in 1950. Carl Jung's foreword to that edition carried the I Ching into the vocabulary of psychology and, later, of 1960s counterculture.

In practice there is an order to consulting it. Rather than a yes-or-no question, frame something with room in it: what is the grain of this situation, how should I carry myself here. Then cast, read the statement of the primary hexagram, read the statements of any changing lines, and turn every changing line to its opposite to obtain the resulting hexagram, which suggests where things are heading. With no changing lines, the hexagram statement alone carries the reading; with one, that line takes the center.

The philosophy running through it all is the harmony of yin and yang and ceaseless change. What is fullest begins to wane; within the deepest dark, the seed of light is already held. So even a favorable hexagram warns against arrogance, and a hard one need not lead to despair. One thing should be stated plainly: what the hexagram says is not a scientifically proven prophecy but a mirror in which to see yourself before change. The same hexagram reads differently by the asker's circumstance, and the changing lines lead to a different next scene depending on how you move.

The true use of the I Ching lies not in fixing an answer, but in that brief reflection that makes you pause and weigh your situation one layer deeper. When no answer is in sight, to call a hexagram to mind and quietly gauge whether now is to advance or to wait, to fill or to empty — that one quiet moment may be the most precious gift the book has passed down across thousands of years. FortuneLeaf's I Ching, too, borrows this old wisdom of change to stand beside you as you see your present flow a hand's width more clearly.