What is the I Ching?
OverviewThe I Ching (Yi Jing), or Book of Changes, is one of the oldest Chinese classics and the first of the Five Classics. Its name carries three senses in one word — the simple, the changing, and the constant. Built on sixty-four hexagrams of broken and solid lines, it began as a manual of divination and, through Confucius and the Ten Wings, grew into a work of philosophy about change itself — earning the name "wellspring of the great Dao."
The Simple
Heaven and earth work through ease
The Creative knows through ease, the Receptive acts through simplicity — the way of nature is fundamentally plain, and so embraces all things.
The Changing
Yin and yang in ceaseless flux
"As the firm and the yielding displace each other, change arises." Constant transformation is the natural state of the world the book describes.
The Constant
A changeless order within change
Amid all flux there remains an unchanging pattern — high and low, the rhythm of the seasons — a constancy that never shifts.
History
Three sages, three agesTradition holds that the book "passed through three sages across three ages" — drawn, worded, and given its commentaries by successive hands over a thousand years:
- Fu Xi 伏羲High antiquity
Looking up to the heavens and down to the earth, he is said to have first drawn the eight trigrams.
- King Wen 文王Middle antiquity
Imprisoned at Youli, he is traditionally credited with pairing the trigrams into the 64 hexagrams and composing the hexagram statements.
- Duke of Zhou 周公Middle antiquity
Traditionally credited with the line statements for all 384 lines.
- Confucius 孔子Low antiquity
Said to have written the Ten Wings, lifting the book from a manual of divination into a work of philosophy.
The Classic and the Ten Wings
StructureThe work has two layers. The Classic is the original core: the sixty-four hexagrams with their judgment and line statements. The Ten Wings (Yi Zhuan) are seven commentaries in ten sections, traditionally ascribed to Confucius — "wings" that lift the text into thought.
Commentary on the Decision — explains each hexagram statement.
Commentary on the Images — the Great Image reads the hexagram, the Small Image each line.
Commentary on the Words — devoted to the first two hexagrams, Qian and Kun.
The Great Treatise — the philosophical heart of I Ching thought.
Discussion of the Trigrams — their images, qualities and directions.
The Sequence — the logic ordering the 64 hexagrams.
Miscellaneous Notes — hexagram meanings paired by contrast.
The 64 hexagrams
Eight trigrams, doubledEight basic trigrams, each three lines standing for a force of nature, combine two at a time to form the sixty-four hexagrams — every one a situation, read from the bottom line upward.
The full set of sixty-four is laid out below in the traditional King Wen arrangement — a chart for looking up any hexagram by the two trigrams that compose it. Or build one yourself:
The diagonal (highlighted) holds the eight “doubled” hexagrams, where the upper and lower trigrams are the same.
Upper trigram (outer)
Lower trigram (inner)
All 64 hexagrams — names at a glance
Two schools of reading
Image-number & meaning-principleFor two thousand years the I Ching has been read through two great lenses, rivals that ultimately complete each other.
Image-and-Number
Reads the book through the structure of images and numbers — trigram symbolism, line positions and cosmological correlation. Strong on divination and the workings of nature.
Meaning-and-Principle
Reads the book for its ethical and philosophical sense — human affairs, character and the moral order. Strong on guidance for conduct and statecraft.
How to study the I Ching
A path in- 1Learn the lines and trigrams
Begin with yin (broken) and yang (solid) lines, then the eight trigrams and the natural images they stand for.
- 2Read the hexagrams
Work through the 64 hexagrams with their judgment and line statements, watching for the turning points of fortune.
- 3Study the Ten Wings
Let the Tuan, Xiang and Great Treatise carry you from image to principle and the deeper intent.
- 4Consult it yourselfCast a free reading
Cast a reading with yarrow stalks or coins to see how a living hexagram answers a real question.
The I Ching in the West
InfluenceFew Eastern books have reached so far into Western thought, science and art:
Binary & Leibniz
Gottfried Leibniz saw his binary arithmetic mirrored in the broken and unbroken lines of the 64 hexagrams — an early bridge between the I Ching and the mathematics behind modern computing.
Jung & psychology
Carl Jung wrote the foreword to the Wilhelm–Baynes translation and drew on the oracle to develop his idea of synchronicity — meaningful coincidence rather than cause and effect.
Art & chance
Composer John Cage used the I Ching to make chance-determined music (Music of Changes, 1951); the book left deep marks on 20th-century art and counterculture.
Philosophy & ethics
Its account of change and balance became a shared root for Confucian and Daoist thought, and the seed of later Neo-Confucian metaphysics.
Frequently asked questions
FAQ- What is the I Ching?
- The I Ching, or Book of Changes (Chinese: Zhou Yi), is one of the oldest Chinese classics and the first of the Five Classics. At its core are 64 hexagrams — six-line figures built from broken (yin) and solid (yang) lines — each with a judgment and line statements. Originally a divination manual, it became, through the Ten Wings commentaries, a foundational work of philosophy about change, balance and the patterns underlying events.
- What is the difference between the I Ching and the Zhou Yi?
- They name the same book. "Zhou Yi" (literally "the Changes of Zhou") is the older, more formal title and strictly refers to the original Classic plus the Ten Wings commentaries. "Yi Jing" / "I Ching" means "Classic of Changes" and is the common name for the whole work. In English, "I Ching" and "Book of Changes" are used interchangeably.
- How do you read or consult the I Ching?
- You hold a question in mind and generate six lines, from the bottom up, using the yarrow-stalk method or the simpler three-coin method. Each toss yields a yin or yang line, and some lines are "changing" lines. The six lines form a hexagram; you read its judgment and any changing-line statements, then the second hexagram those changing lines transform into. The reading is meant to prompt reflection on your situation, not to predict a fixed future.
- How many hexagrams are in the I Ching, and how are they built?
- There are 64 hexagrams. Each is made of two trigrams — an upper and a lower — drawn from the eight basic trigrams (Heaven, Earth, Thunder, Water, Mountain, Wind, Fire, Lake). Eight trigrams combined two at a time give 8 × 8 = 64 hexagrams, and each hexagram has six lines, for 384 lines in all.
- Is the I Ching just a fortune-telling book?
- No. Divination is its origin and one of its uses, but after Confucius and the Ten Wings the I Ching became a work of philosophy — about how situations change, when to act or wait, and how to keep balance. It deeply shaped Confucian and Daoist thought and is read today as much for wisdom and self-reflection as for divination.
- Which English translation of the I Ching should I read?
- The Richard Wilhelm translation, rendered into English by Cary F. Baynes with a foreword by Carl Jung (1950), is the most influential Western edition and a good starting point. James Legge's 1882 translation (Sacred Books of the East) is the classic scholarly version. For the original, the Chinese text with its judgments and line statements remains the ultimate source.
Keep exploring
Further reading
- The I Ching, or Book of Changes · Richard Wilhelm; trans. Cary F. Baynes; foreword by C. G. Jung (1950)The standard and most influential Western edition
- The Yî King (Sacred Books of the East, Vol. 16) · Trans. James Legge (1882)The classic scholarly English translation
- Zhouyi: The Book of Changes · Trans. Richard Rutt (1996)A modern philological reading of the original text
- Zhou Yi Zheng Yi 周易正义 · Kong Yingda (Tang dynasty)The orthodox classical commentary, meaning-and-principle school