The I Ching (易经 yì jīng), the Book of Changes, is the oldest of the Chinese classics and the root from which the other metaphysical arts grow. It is a system of sixty-four hexagrams (六十四卦 liù shí sì guà), each a figure of six lines, that models a situation and the way it is tending to change. A question is held, a hexagram is cast, and its counsel — together with any changing lines — is read as guidance. At Butcher Boy it is framed plainly: the I Ching describes the shape of a moment and where it leans, not a fixed fate.
This guide is the way in. It explains what the I Ching is, how its hexagrams are built from trigrams, how to cast and read one, and where to go deeper — including a free casting tool and a page for every one of the sixty-four hexagrams.
What the I Ching Is
For three thousand years the Book of Changes has been consulted as an oracle and studied as philosophy. Its premise is simple and profound: everything is in motion, yin (阴 yīn) yielding to yang (阳 yáng) and back again, and every situation carries the seed of its own turning. Read our full introduction in what is the I Ching, and the philosophy behind the name in the meaning of the I Ching. For where it came from, see a short history of the I Ching.
易经 · Book of Changes
Cast your own hexagram. Six throws build your hexagram and any changing lines, each linked to a plain reading. Free, in your browser.
>The Philosophy of Change
Beneath the hexagrams sits a single idea: nothing holds still. The two primal forces, yin (阴 yīn) and yang (阳 yáng), are not fixed things but a relationship — the shaded and sunlit sides of one slope, each giving way to the other. A solid line pictures yang, a broken line yin; stacked six deep, they map how a moment is weighted between the two. Because yang at its fullest begins to yield to yin, and yin at its depth turns back toward yang, no situation is a dead end. The changing lines are this law made visible: the point where a full line has ripened and is ready to break, or a broken line to close and firm. To read the Book of Changes is to read timing — where a thing sits on its own cycle, and which way the next step leans. The philosophy behind the name is unpacked in the meaning of the I Ching.
Trigrams and Hexagrams
The building blocks are the eight trigrams (八卦 bā guà) — three-line figures for Heaven, Earth, Thunder, Water, Mountain, Wind, Fire, and Lake, each with an element and a character. Stack two trigrams and you have a hexagram; the sixty-four are every possible pairing. Learn the trigrams in the eight trigrams, and how the sixty-four arise in the 64 hexagrams. Every hexagram has its own page — from Hexagram 1, the Creative and Hexagram 2, the Receptive, through to After Completion and Before Completion.
The Ten Wings
The I Ching began as a divination manual — trigrams, hexagrams, and terse line texts. What turned it into a classic studied by scholars is a set of commentaries known as the Ten Wings (十翼 shí yì), traditionally associated with Confucius and his school. These appendices give the book its philosophy: a great treatise on how change works, commentaries on the Judgment and the Image, and shorter wings explaining the trigrams and the ordering of the sixty-four. They are why the same book can be consulted as an oracle in the morning and read as a work of thought in the evening. For how these layers gathered over the centuries, see a short history of the I Ching. When these pages paraphrase a hexagram’s Judgment and Image, they draw on this commentarial tradition put into plain words, not on any single modern translation.
How to Cast and Read
A reading has three steps: form a clear question, cast six lines, and read the hexagram they build. The traditional methods use three coins or fifty yarrow stalks — both explained in how to cast the I Ching. Once you have a hexagram, how to read the I Ching walks through its Judgment and Image as plain counsel.
The most alive part of a reading is its changing lines: lines that are “old” transform into their opposite, turning your first hexagram into a second. The first is where you are; the changing lines are the active edge; the second is where the situation tends.
Cast the I Ching Now
You do not need coins to begin. Our free I Ching casting tool throws the six lines for you, builds your hexagram and any changing lines, and links each result straight to its reading. The cast is computed by the same verified sequence these pages use — nothing is guessed.
How the I Ching Is Used Today
Three thousand years on, the Book of Changes is consulted much as it always was, if for quieter reasons. People bring it a decision that genuinely hangs in the balance — a move, a partnership, a matter of timing — and use the cast hexagram as a structured mirror: a way to slow down, name the forces in play, and hear counsel from outside their own worry. It is also studied rather than cast: read straight through, the sixty-four hexagrams are a catalogue of human situations and a measured response to each. And it remains the shared root of the other Chinese arts — the same trigrams and yin-yang logic run through Ba Zi, feng shui, and the divination systems. Held this way, a reading is not a prediction to obey but a considered second opinion. Form an honest question, cast the lines with the casting tool, and read where they point.
The I Ching and Ba Zi
The I Ching is the root; Ba Zi (八字 bāzì) is one of its branches. The yin-yang logic and the five elements you meet here are the same ones that structure a Ba Zi birth chart. Where the I Ching answers a question in the moment, Ba Zi reads the enduring pattern of a life. We set them side by side in I Ching vs Ba Zi. To read your own pattern, plot your chart free with the Ba Zi calculator, and when a decision carries weight, a personal reading weighs it properly.
Start Here
If you are new, read what the I Ching is, learn the trigrams, then cast your first hexagram and read where it points. The Book of Changes has counselled careful people for three millennia; it rewards a clear question and an honest ear. Cut through fate, one changing line at a time.