Image and number vs meaning and principle: the two ways to read the I Ching

For two thousand years, readers of the I Ching have split into two broad camps. The image-and-number school (象數, xiangshu) reads a hexagram as a structure: trigrams, line positions, hidden inner figures, numbers and calendar correspondences. The meaning-and-principle school (義理, yili) reads it as a situation with a moral logic, and asks what conduct the text recommends. Most good readings use both, and knowing which one you are doing at any moment keeps you honest.

Where the two schools come from

The split is old enough that the imperial Siku Quanshu catalogue, in its preface to the Yi section, summed up the whole commentary tradition as 兩派六宗 — "two currents and six lineages". The two currents are these.

Image and number dominated the Han dynasty. Han scholars such as Meng Xi (孟喜) and Jing Fang (京房) tied the hexagrams to the seasons, the calendar and the five phases; later Han readers, Yu Fan (虞翻) the best known, explained almost every word of the text by some image hidden in the hexagram — an inner trigram, a line that "should" move, a trigram that appears when a line changes. Jing Fang's eight palaces and his attachment of stems and branches to the lines live on today in Six Lines divination.

Meaning and principle begins, as a self-conscious school, with Wang Bi (王弼, 226–249). Tired of image-hunting, he asked: 義苟在健，何必乾乃為馬？ — "if the meaning is strength, why must Qian be a horse?" For Wang Bi the images are a means to grasp a meaning, and once you have the meaning you can let the image go. The Song scholar Cheng Yi (程頤) took this further in his commentary, reading every hexagram as a lesson in timing and conduct. You can read more in our guide to Wang Bi and the meaning school.

The Song also had a new image-and-number revival — Shao Yong's diagrams and number schemes, the source of Plum Blossom numerology. And Zhu Xi (朱熹), the most influential editor of all, refused to choose: he insisted the Zhouyi was made for divination in the first place, so its images and numbers matter, but he read the result with Cheng Yi's moral seriousness. See Zhu Xi and the Zhouyi Benyi.

What image and number looks for

When an image-and-number reader sees a cast, they take it apart:

• The two trigrams and their images, directions, family members and elements (from the Shuogua commentary; see the eight trigrams).
• Inner trigrams (互卦) formed by lines 2–4 and 3–5, and the hexagrams they make (explained in nuclear, inverse and opposite hexagrams).
• Line position: is a yang line in an odd place, a yin line in an even one? Do lines 1 and 4, 2 and 5, 3 and 6 answer each other?
• What the changing line turns a trigram into — often the key to an image in the line text.
• In later systems, numbers and time: the hexagram's palace, its stems and branches, the month and day of the cast.

The strength of this approach is that it explains why the text says what it says. Its weakness is that, with enough tools, you can find an image for anything.

What meaning and principle looks for

A meaning-and-principle reader asks different questions:

• What kind of time is this hexagram? Growth, obstruction, waiting, return?
• What does the Judgment say about the right attitude, and what does the Great Image ("the superior person, in accordance with this …") say about conduct?
• Where does the moving line stand in the arc of the situation — beginning, middle, excess at the top?
• What would a person of integrity do here?

Its strength is clarity and usefulness: you come away with a stance. Its weakness is that it can drift into generic moral advice that ignores the actual figure in front of you.

One cast read both ways

Suppose you ask how to handle a difficult period at work and cast Hexagram 36, Ming Yi, "Brightness Hidden", with only the second line moving. The line text speaks of brightness wounded in the left thigh, and ends 用拯馬壯，吉 — "help comes with a strong horse: good fortune."

Read by image and number. Li (fire, the sun) sits under Kun (earth): the sun has gone below the horizon. The second line is yin in a yin place and central — correct and balanced — but its partner in the fifth place is also yin, so it gets no answering support from above. Change that line and the lower trigram Li becomes Qian; the whole figure becomes Hexagram 11, Tai, Peace. And Qian is the trigram of the horse in the Shuogua: the "strong horse" of the line text is the very trigram the line produces. The inner trigrams (lines 2–4 Kan, 3–5 Zhen) make Hexagram 40, Xie, Release — a hint that the difficulty can be loosened.

Read by meaning and principle. Ming Yi is a time when the capable are kept down and brightness must be guarded. The second line is hurt but not crippled — a wound in the thigh, not the heart. The advice is to act promptly and with strength to get yourself (and others) out of harm's way, without abandoning your principles; done that way, the outcome is good, and the movement toward Tai shows the dark period giving way.

Notice that the two readings do not contradict each other. The image reading tells you why the horse is there and why the outcome leans toward peace; the meaning reading tells you what to do on Monday. Wang Bi would say the horse is only a figure for speed and strength — and he would be right about what matters for your conduct. An image reader would answer that the change from Li to Qian is exactly how you know the text means strength. Both are describing the line page from a different angle.

Where the tradition disagrees

It is fair to say the schools still argue. Image-and-number readers point out that much of the line text is unintelligible without images; meaning readers answer that Han image-hunting produced arbitrary explanations that could justify any verdict. Modern scholarship on the excavated manuscripts (see the history of the I Ching) suggests the earliest users read the text mainly as omens and images, while the moral reading comes largely from the Ten Wings and later. Neither side owns the "original" I Ching.

How to use both when you read a cast

A practical order that respects both schools:

• Start with meaning. Read the Judgment, the Great Image and the moving line text in plain terms, and write one sentence: what kind of time is this, and what stance does it ask of you?
• Then check the structure. Look at the two trigrams, the moving line's position and what it changes into. Use the images to confirm or sharpen your sentence, not to replace it.
• Stop when the image stops helping. If you find yourself stacking inner trigrams and number tricks to rescue a verdict you prefer, that is the failure both schools warned against.
• Use number systems as a separate method. If you want stems, branches, the month and day, treat that as its own technique — Six Lines — with its own rules, rather than mixing a little of it into a text reading.

When you cast a reading, the result page gives you the text first and the trigram structure alongside it: that is meaning and image side by side, and you can lean on whichever the question needs.