What Is I Ching? A Modern Reader's Guide to the 64 Hexagrams

I Ching (Yi Jing, 易经), also called the Book of Changes, is a Chinese divination and philosophy system built on 64 hexagrams — six-line figures composed of broken (yin) and unbroken (yang) lines. Each hexagram is formed by stacking two of the eight trigrams (Bagua, 八卦), producing 64 unique configurations that map every kind of situation a person can face. To consult the I Ching, frame one specific question, cast six lines (traditionally with yarrow stalks or three coins), look up the resulting hexagram, and read its judgment, image, and any changing lines. The I Ching does not predict outcomes — it diagnoses where you stand in a situation and what energy is moving through it, leaving the action to you.

Most people who pick up the I Ching are at a moment where the next move is unclear and ordinary advice is no longer enough. Unlike a horoscope or a tarot deck, the I Ching is built to be slow and exact — its 64 hexagrams cover situations as specific as "great possession," "darkening of the light," and "the cauldron." TodayFlow's free I Ching tool lets you cast a hexagram online in under a minute — and after you cast, Yann, TodayFlow's Feng Shui guide for I Ching and Chinese divination, can walk you through what your hexagram means in modern context.

→ Cast a hexagram for free on TodayFlow

Origins of the I Ching: From Fuxi to the Wilhelm Translation

The I Ching is one of the oldest continuously used texts in the world. Its core layers were composed across more than a thousand years of Chinese history:

• The Eight Trigrams (Bagua) are traditionally attributed to Fuxi, a mythological cultural founder said to have observed the patterns of nature and abstracted them into eight three-line figures. Whether or not Fuxi was a single historical person, the trigrams predate written history and appear on Bronze Age artifacts.
• The 64 Hexagrams and the Judgments (卦辞) were composed by King Wen of Zhou (周文王, around the 11th century BCE), traditionally during his imprisonment by the last Shang Dynasty king. King Wen arranged the 64 hexagrams in the order still used today and wrote a short verdict for each.
• The Line Texts (爻辞) — short interpretive sayings for each of the 384 individual lines — were added by the Duke of Zhou (周公), King Wen's son.
• The Ten Wings (十翼), a layer of philosophical commentary that turned the I Ching from a divination manual into a philosophy text, were attributed to Confucius (孔子, 551–479 BCE) and his school during the Spring and Autumn period.

In English, the standard modern translation is the Wilhelm-Baynes edition (Princeton Bollingen, 1950) — Cary F. Baynes's English rendering of the German translation by sinologist Richard Wilhelm. The edition carries an introduction by Carl Jung, who became fascinated with the I Ching's view of "synchronicity" — the idea that the moment of casting and the resulting hexagram are not coincidence but meaningful coincidence. The Wilhelm-Baynes hexagram names (The Creative, The Receptive, Difficulty at the Beginning, and so on) are the names you will see in nearly every serious English I Ching reference today.

How the I Ching Works: From Lines to Hexagrams

The I Ching's elegance is that the entire 64-hexagram system is built from one binary distinction: yin (broken line, ⚋) and yang (solid line, ⚊).

Stack three lines and you get a trigram — eight possible combinations, each tied to a fundamental natural force (Heaven, Earth, Thunder, Water, Mountain, Wind, Fire, Lake). Stack two trigrams and you get a hexagram — six lines, 64 possible combinations, each describing a distinct situation or movement of energy.

The math is exact: 2⁶ = 64. The I Ching is a complete, finite map of every configuration of yin and yang across six lines, and Chinese tradition holds that those 64 configurations cover every general type of situation a person can encounter.

The Eight Trigrams (Bagua): The Building Blocks

The eight trigrams are the alphabet of the I Ching. Memorize these and you can read any hexagram by recognizing which two trigrams compose it.

Trigram	Lines	Pinyin	Meaning	Image	Quality
☰	⚊⚊⚊	Qian	The Creative	Heaven	Strong, active, originating
☷	⚋⚋⚋	Kun	The Receptive	Earth	Yielding, supportive, accommodating
☳	⚋⚋⚊	Zhen	The Arousing	Thunder	Sudden, awakening, shocking
☵	⚋⚊⚋	Kan	The Abysmal	Water	Dangerous, deep, flowing
☶	⚊⚋⚋	Gen	Keeping Still	Mountain	Stillness, boundary, stopping
☴	⚊⚊⚋	Xun	The Gentle	Wind	Penetrating, persistent, subtle
☲	⚊⚋⚊	Li	The Clinging	Fire	Illumination, beauty, dependency
☱	⚊⚊⚋	Dui	The Joyous	Lake	Pleasure, openness, exchange

Each trigram is read from bottom to top — the bottom line is line one, the top line is line three. This bottom-up convention applies to hexagrams as well, and it reflects the I Ching's view of time: the bottom is the early, internal, and emerging; the top is the late, external, and departing.

The 64 Hexagrams: A Complete Map of Situations

A hexagram is a six-line figure made by stacking two trigrams — the lower trigram (lines 1-3) below the upper trigram (lines 4-6). The 64 hexagrams cover the full range of human situations, from the most auspicious to the most challenging.

A few well-known examples:

• Hexagram 1, Qian · The Creative · Heaven (☰☰): six unbroken lines. Pure creative force at its peak. Action is favored; success comes through steady perseverance.
• Hexagram 2, Kun · The Receptive · Earth (☷☷): six broken lines. Pure yielding receptivity. Strength comes through openness and supporting what wants to grow.
• Hexagram 11, Tai · Peace (☷☰): Earth above, Heaven below. The energies meet and circulate. One of the book's most auspicious signs.
• Hexagram 12, Pi · Standstill (☰☷): Heaven above, Earth below — the same trigrams as Tai but inverted. The energies pass each other without touching. The wise withdraw and let the season turn.
• Hexagram 64, Wei Ji · Before Completion (☲☵): Fire above, Water below. The closing hexagram of the entire book — and tellingly, it is "before" rather than "after" completion. The I Ching ends not with arrival but with the threshold, suggesting that no situation is ever truly final.

Every hexagram in the TodayFlow I Ching tool is graded on a four-level fortune scale that translates the traditional auspiciousness rating:

• Supreme Flow (上上卦) — exceptional alignment; act with confidence
• Favorable Flow (中上卦) — generally supportive; move forward attentively
• Mixed Flow (中下卦) — uneven conditions; pick your moves carefully
• Challenging Flow (下下卦) — significant obstacles; pause and reconsider direction

A Challenging Flow hexagram is not a verdict of doom. It is information: the current configuration of forces is against your move, and pushing harder will not help. Often the most useful hexagrams are the difficult ones, because they correct a course before real damage is done.

Changing Lines: Why the I Ching Isn't Static

A hexagram captured in a single moment is only half the reading. The other half is the changing lines — lines that, in the casting process, come up as "old yin" or "old yang" rather than "young." Old lines are unstable; they are about to flip into their opposite, generating a second hexagram known as the resulting hexagram.

A reading with changing lines is read in three steps:

1. The primary hexagram describes the current situation.
2. The changing lines describe specifically what is moving and how.
3. The resulting hexagram (with the changing lines flipped) describes where the situation is heading.

A reading with no changing lines is a stable snapshot — the situation is simply what the primary hexagram describes. A reading with one or two changing lines is the most readable; rich with information without overwhelming. A reading with five or six changing lines is unusual and often signals a moment of major transformation.

How to Cast a Hexagram (5-Step Walkthrough)

The traditional casting method uses fifty yarrow stalks in a complex 18-step procedure that takes about half an hour. Most modern practitioners use the simpler three-coin method, which produces equivalent results in five minutes. Online tools simulate the same probability distribution in seconds.

Step 1: Settle Your Mind and Frame One Specific Question

Sit quietly for at least one minute. Frame your question concretely: "Should I accept this offer?" or "What is the right approach to this conflict?" — not "What does my future hold?" The I Ching answers focused questions clearly and vague questions vaguely. A diffuse question yields a diffuse hexagram.

Step 2: Choose Your Casting Method (Three Coins or an Online Tool)

For three coins, use any three identical coins. Heads count as 3, tails count as 2. Cast all three together; the sum (6, 7, 8, or 9) determines the line. For online tools such as the TodayFlow I Ching, the same probabilities are simulated automatically.

Step 3: Cast Six Lines from Bottom to Top

Cast the coins six times. The first cast is line 1 (the bottom of the hexagram). The sixth cast is line 6 (the top). Each cast yields one of four results:

• 6 = old yin (broken line, changing into yang)
• 7 = young yang (solid line, stable)
• 8 = young yin (broken line, stable)
• 9 = old yang (solid line, changing into yin)

Sixes and nines are changing lines. Sevens and eights are stable.

Step 4: Read the Primary Hexagram's Judgment and Image

Identify your primary hexagram from the six lines and look up its judgment (the short verdict) and image (the meditation on the upper and lower trigrams). Read both slowly. The judgment is the verdict; the image is the meditation that grounds the verdict in natural metaphor.

Step 5: Read the Changing Lines and the Resulting Hexagram

If your hexagram has changing lines, read the line text for each changing line — these are the most specific and active part of the reading. Then flip those lines (6 becomes 7, 9 becomes 8), identify the resulting hexagram, and read its judgment as the direction the situation is moving toward.

What I Ching Can and Cannot Tell You

The I Ching is a precise instrument when used within its proper range and a misleading one when stretched beyond it. Knowing the boundaries is part of using it well.

The I Ching can tell you:

• The current configuration of forces around a specific question or situation
• What kind of stance — advance, retreat, hold steady, gather allies — is appropriate now
• Where energy is moving (through the changing lines and resulting hexagram)
• How to interpret a moment that ordinary analysis cannot resolve

The I Ching cannot tell you:

• Specific dates, names, or quantitative outcomes ("the deal will close on March 14")
• Yes or no in any literal sense — its answers are postures and trajectories, not verdicts
• A definitive future, since it explicitly assumes that conditions and your responses both shape what unfolds

The I Ching's deepest premise is summed up in its name: change. Nothing the hexagram describes is permanent, and your response is the most important variable in what comes next.

Frequently Asked Questions

How is I Ching different from Bazi or the Guan Yin Oracle?

The three systems answer different kinds of questions. Bazi describes the energy structure you were born with — your innate temperament, life pattern, and decade-by-decade trajectory. The Guan Yin Oracle answers one specific situational question with a single drawn sign. The I Ching sits between them: it diagnoses the configuration of forces around a current situation in detail and shows where it is heading. A useful rule: use Bazi to understand who you are, the Guan Yin Oracle for a quick verdict on a specific decision, and the I Ching when a situation is complex enough that you need to see the whole field.

Can I ask the I Ching the same question twice?

Generally no. The first reading is the answer. Asking again because you disliked the result is not consultation; it is denial. Two situations justify a second reading: a substantive change in circumstances has occurred, or you have refined the question into something more specific and want to ask the new version. Even then, wait at least a day between readings on the same theme.

What does it mean if my reading has no changing lines?

A static reading is a snapshot — the situation is what the primary hexagram says it is, and no major movement is currently in motion. Static readings are common and not negative. They typically mean the answer to your question is contained in the primary hexagram alone, and you can act on its guidance without complicating the picture.

How accurate is the I Ching?

Accuracy is the wrong frame. The I Ching does not predict events; it describes the energy of the moment you cast the hexagram. The "accuracy" you experience is the precision with which the hexagram's image fits your actual situation — which, for serious questions asked in a focused state, is often uncanny. For trivial or insincere questions, the same hexagrams feel vague. The instrument is honest; it returns what you put in.

My reading feels confusing — how do I make sense of it?

Three options. First, sit with the hexagram for 24 hours; meaning often surfaces only on the second reading. Second, look at the hexagram image rather than the words — the relationship between the upper and lower trigrams (Heaven over Earth, Fire over Water, and so on) often clarifies what the verdict alone leaves vague. Third, ask Yann, TodayFlow's Feng Shui guide for I Ching and Chinese divination, to interpret the hexagram against your actual circumstances. A reading is rarely "confusing" once it is grounded in your real situation.

→ Talk to Yann about your hexagram

Cast Your Own Hexagram

You now have the framework to consult the I Ching: how it works, where it came from, and how to read what it returns. The most efficient way to deepen your understanding is to cast one for yourself.

→ Free online I Ching on TodayFlow — frame one specific question, cast a hexagram in seconds, and read the primary hexagram, changing lines, and resulting hexagram laid out clearly.

If your hexagram is complex or you want to discuss what it means for a specific decision in your life, you can also chat with Yann, TodayFlow's Feng Shui guide for Bazi, I Ching, and Chinese divination, who reads the hexagram in the context of the actual situation you are facing.

→ Chat with Yann