Preface: Orientation

This article was translated from the original Chinese by AI. Nuances may differ from the source.

In the divinatory system of Yi learning, if we regard the Primary Hexagram, Transformed Hexagram, and Moving Lines as the "skeleton and flesh" of a matter (the core that determines fortune and misfortune), then the Mutual Hexagram, Reversed Hexagram, and Inverted Hexagram constitute its "meridians and spirit" (revealing causes and details).

• Principle: Maintain clear priorities. First examine the Primary and Transformed Hexagrams with their moving lines (primary); then consult the Mutual, Reversed, and Inverted Hexagrams (auxiliary). Never let the secondary overshadow the principal.

Chapter One: Definitions and Functions (The Toolkit)

Before putting these tools to use, let us first clarify what dimension each one represents:

1. The Mutual Hexagram (Hu Gua): The "Hidden Core" of a Matter

• Derivation: Take the second, third, and fourth lines of the Primary Hexagram as the lower trigram, and the third, fourth, and fifth lines as the upper trigram.
• Function: Reveals the intermediate process, internal structure, or core method by which a situation develops.
• Metaphor: "The flesh of the fruit." The surface appears one way (Primary Hexagram), but bite into it and the interior is quite different (Mutual Hexagram).

2. The Reversed Hexagram (Zong Gua): "Seeing Through Another's Eyes"

• Derivation: Flip the Primary Hexagram 180 degrees (the bottom line becomes the top, the second line becomes the fifth, and so on).
• Function: Reveals the other party's perspective, the objective circumstances, or the two inseparable faces of a single matter.
• Metaphor: "The mirror." You believe you are advancing (Primary Hexagram), but seen from the other side, you are actually retreating (Reversed Hexagram).

3. The Inverted Hexagram (Cuo Gua): "The Shadow of Opposition"

• Derivation: Invert every line of the Primary Hexagram (yang becomes yin, yin becomes yang).
• Function: Reveals lurking dangers, missing elements, or the most acute point of tension.
• Metaphor: "The shadow." The stronger the light (Primary Hexagram), the darker the shadow (Inverted Hexagram).

Chapter Two: When to Use Them (Trigger Conditions)

Not every divination requires all three. Only under the following four circumstances is it advisable to bring in auxiliary analysis:

1. A Static Hexagram (No Lines Change) — Essential

• Reason: Without moving lines, there is no indication of movement. Information is extremely scarce, so one must excavate the Mutual Hexagram to uncover internal tensions, and consult the Reversed and Inverted Hexagrams to assess the external environment.
• Application: Elevate the Mutual Hexagram's weight to 40%.

2. Chaotic Movement (Three or More Lines Change) — Recommended

• Reason: The situation is turbulent; individual line statements may contradict one another, calling for a macroscopic perspective.
• Application: Use the Reversed Hexagram to observe the oscillations of the larger picture; use the Inverted Hexagram to gauge extreme risks.

3. Fortune Uncertain (Ambiguous Information) — Supplementary

• Reason: The Primary Hexagram is auspicious but the Transformed Hexagram is ominous, or the line texts are equivocal.
• Application: Use the Mutual Hexagram to trace the process and determine whether something went wrong along the way, leading to an unfavorable outcome.

4. In-Depth Consultation (Decision Analysis) — Deep Reading

• Reason: The querent wishes to know not merely "whether the outcome is good or bad," but also "what to do," "what to watch for," and "why things stand as they do."
• Application: Conduct a holographic reading; search for the pivotal point of breakthrough.

Chapter Three: How to Use Them (Operational Procedure)

Follow this strict "Four-Step Method" for interpretation:

Step One: Determine the Nature (Examine the Primary and Transformed Hexagrams)

• First read the judgment text of the Primary Hexagram to see the starting point; then read the judgment text of the Transformed Hexagram to see the destination.
• Conclusion: Establish the fundamental tone of fortune or misfortune (auspicious or inauspicious, major or minor).

Step Two: Analyze the Cause (Examine the Mutual Hexagram)

• Question: Why has this outcome come about$1 What occurred along the way$2
• Procedure: Lay out the Mutual Hexagram.
  • If the Mutual Hexagram is auspicious, internal operations are running smoothly and support the Primary Hexagram.
  • If the Mutual Hexagram is ominous (for instance, if it yields Kan, the Abyss), the exterior is splendid but pitfalls lurk within.
• Phrasing: "On the surface, this matter appears to be A, but in its actual workings it contains the qualities of B; therefore we should address it using B's approach."

Step Three: Reassess (Examine the Reversed Hexagram)

• Question: Am I being too subjective$3 How does this look from the opponent's or an observer's standpoint$4
• Procedure: Lay out the Reversed Hexagram.
  • If the Reversed Hexagram is opposite in nature to the Primary (for example, Xu, Waiting, reverses to Song, Conflict), warn the querent: you believe you are biding your time, but others perceive you as provoking a dispute.
• Phrasing: "Let us shift perspective. If we step outside your own position, this matter is actually..."

Step Four: Risk Control (Examine the Inverted Hexagram)

• Question: What is the worst-case scenario$5 What am I lacking$6
• Procedure: Lay out the Inverted Hexagram.
  • The Inverted Hexagram often represents the side you "refuse to see."
  • If the Primary Hexagram is firm and forceful, the Inverted Hexagram will inevitably be soft and yielding — a reminder to supplement your approach with gentler means.
• Phrasing: "The greatest hidden danger in this matter lies in... You need to cultivate the capacity for..."

Chapter Four: Weight Allocation Table (The Golden Rule)

To prevent interpretive confusion, be sure to observe the following proportional guidelines:

Chapter Five: A Practical Mnemonic (Quick Reference)

Primary and Transformed settle fortune's call,Moving Lines illuminate the path through all.When matters grow tangled, the Mutual revealsWhat outer and inner truly conceals.Reverse the hexagram to know the other side,Understanding both self and foe as guide.In the Inverted, seek the hidden flaw,Shore up your weakness — and triumph stands in awe.

Appendix: Common Pitfalls to Avoid

1. Never let the auxiliary supplant the primary: If both the Primary Hexagram and the moving lines indicate great fortune, yet the Inverted Hexagram is ominous, do not pronounce it ill-fated. The Inverted Hexagram's warning merely counsels you to "remain vigilant in times of peace" — it does not mean the outcome will be bad.
2. Never over-extrapolate: Do not nest layer upon layer (extracting a Mutual Hexagram from the Mutual Hexagram); that leads to an endless numbers game. Examine only the first-level Mutual Hexagram.
3. Never force the framework: If the meaning of the Primary Hexagram is already perfectly clear and straightforward, there is no need to insist on interpreting the Reversed and Inverted Hexagrams. The great Way is, in the end, simple.

Try It Online

Wish to experience the wonder of the Grand Expansion Yarrow Stalk Method and holographic hexagram interpretation for yourself$7 We offer an online Grand Expansion Yarrow Stalk tool that fully simulates the process and automatically calculates the Mutual, Reversed, and Inverted Hexagrams, providing you with an in-depth holographic reading:

Try the Grand Expansion Yarrow Stalk Method Now