Seven in the neck, twelve behind the ribs, five in the small of the back. Twenty-four.1 The Chinese calendar of the time also had twenty-four partitions — twelve solar months and the midpoint of each one.1 So somebody put the two lists side by side, and from then on the spine was a year.
It kept going. The skull was reckoned at eight large bones, and the I-Ching has eight trigrams, so the trigrams were in the head.1 The neck was counted as twelve soft segments, and those were called the twelve stairs of a stupa — the steps of a tower you climb.1 The intestines were compared to the Yangtze running out to the sea, which is why going to the lavatory could be described as the fish returned to the great ocean, everything arriving where it was meant to go.1
You are meant to laugh at that last one. It is also a serious claim about anatomy, and it comes from the book that organised Chinese cultivation for the next eighteen centuries.
Wei Bo-yang wrote the Can Tong Qi, whose title is given here as Different Things Combined with Unity, and the title is the method.2 He took the I-Ching, Lao Tzu, Chuang Tzu, the medicinal and internal-substance practices, five-element theory, and whatever else was in circulation, worked out what they had in common, kept the good parts, and showed how they could be run as a single structure.2 The comparison offered is to Aristotle for classical thought, or Aquinas for the Catholic Church — a man who arrives when a field has too many pieces and leaves it with one shape.2
The result was treated as scripture by the early practitioners and is called the ancestor of all alchemical texts, with an influence that reached Arabia and medieval Europe.3 And then a dry line follows it: anyone who cultivates far enough does not need the book, because they will find all these correspondences by themselves.3
Each of the five planets — Jupiter, Mars, Saturn, Venus, Mercury — was matched to one of the five elements: Wood, Fire, Earth, Metal, Water.4 Then the orbits themselves were given meanings, and the meanings were the energy circulations inside a human body.4
The reason for the astronomy chapter is stated plainly. He wanted practitioners to see that the body is a small copy of the larger universe, that the same forces run inside it, and that knowing this is useful to somebody who's actually practising.5 The pairings he drew are specific. The sun rising and setting is your spirit filling and thinning across a day. The moon waxing and waning is the movement of blood and chi, which also rise and fall on a schedule.6 Vital energy has to travel up the spine for a person to grow, and that travel is put in the same class as a planet on its orbit.6
The system is tidy, and there's exactly one recorded exception in it, which is worth having because it shows what kind of claim this was. A woman's cycle runs about the length of a lunar month — the correspondence holds.7 But women do not all bleed at the same time, and the standard pattern does not predict when any particular woman will. The explanation given is that each woman is her own little universe.7
So the map was never meant to be read as a timetable. It was allowed to bend for the individual case, and the bending was written in from the start rather than patched on later.
This is the sentence the whole page exists for, and it's the one that gets left out of every modern version. He noted that there are real correspondences between the body's small and large circulations and the lunar and solar cycles — and he did not say we had to imitate these things.8
All those circulations are natural events. They do not have to be forced into happening. Just as the planets go round without being pushed, when you cultivate to a certain point the channels and their proper flows will show up by themselves.9 You do not need to do anything to make them appear, and you will never open your channels by using imagination to force the matter.9
The verdict on the modern practice is unusually blunt: people are told to move these circulations around with visualisation, so they push sensations of wind this way and that inside themselves, and this will not even blow out a candle, let alone open a meridian.8
A candle. Not a mountain, not a river — the smallest flame in the house, and all that pushing isn't equal to it.
Which leaves the practice in an odd position, because the instruction here has no action in it. You're given a detailed map of the body as a solar system. You are told the map is accurate. And then you are told that the correct response to an accurate map of a process that runs by itself is to stop interfering with it. The blood and the chi circulate as they should and follow the laws they need to follow, so there is nothing for you to help with.10 Quiet the thoughts, and the circulations that are best for your health and your practice reassert themselves.10
The mechanism given for why this works is the reason the map matters at all. It is mental holding that distorts the flows in the first place — the strain of gripping something creates the obstructions and the narrowings that stop the best pattern from showing.11 So the flows are not absent and waiting to be built. They are present and being bent, and letting go is what unbends them.
That also explains the order of operations, which is stated as a chain: let go of thoughts and the flows harmonise, harmonised flows settle the mind, a settled mind gets very clear, and out of that clarity both absorbed stillness and direct wordless knowing can be born.11
The practical use of the correspondence map turns out to be diagnostic rather than operational, and there's a worked case for it. Cultivate far enough and the body gets more sensitive, unavoidably.12 You start to feel the chi in a place, or in another person, and you can tell what is wrong with somebody's practice.12 Then comes the confusing part: an uncomfortable feeling in you might not be your illness at all. It might be the result of sitting next to somebody whose chi is unpurified.12
Or it might be internal weather. Different chi-fronts inside the body meet and behave turbulently, the way high and low pressure systems collide and make a storm.12 That's a normal event in a sensitive body and not a symptom of anything at all.
This is why the Yellow Emperor's Classic of Internal Medicine is named as required reading for practitioners of any school.13 The body stays karmically tied to the earth it came from even at high attainment, so it goes on answering the seasons and the weather.14 Meditation sharpens that response into something like an instrument.12 An expert meditator therefore needs to know what the seasons will do to him, or he will keep mistaking the calendar for a crisis.
The map isn't driving anything here. It's telling him what arrived.
It's February and you've been sitting badly for three weeks. Heavy in the mornings, no energy at four in the afternoon, and a session yesterday where nothing at all seemed to move. The temptation is to add something. A new technique, a longer sit, some deliberate work at pushing the energy up your back — and the whole of this chapter is a warning against the last of these. Pushing the sensation around the body is the one thing named as useless, and the reason is that you would be interfering with a process that is not broken.
So do the other thing. Ask what the weather is. It is February; you are getting less light and your food has changed; the heaviness may belong to the month rather than to you. Ask who you have been sitting near. Ask what you ate. These are not evasions of the spiritual question — on this account they are the spiritual question, because the body is a small solar system and it responds to the large one.
Then go back to the sitting and take something away rather than adding it. Stop trying to feel anything in particular. Let the thoughts go without pushing them off, and let the session be as flat as it wants to be.
What you are trusting is the claim about causation. If the flows are being bent by holding rather than being absent, then loosening is the whole intervention, and it will not look like an intervention from the inside. It will look like a boring month of sitting, and then one day it won't.
🚩 SINGLE SOURCE — the correspondence list and the non-imitation instruction come from one practitioner text summarising a second-century book it does not quote directly. 🚩 SECONDARY WITHOUT PRIMARY applies: the Can Tong Qi is described, not cited. [POPULAR SOURCE].
The strongest support is internal and structural. The non-imitation rule is not a stray remark — it is required by the causal claim underneath it, that holding is what distorts the flows. If distortion comes from gripping, then a practice built on deliberate mental steering must make things worse, and the two halves fit without strain.
The tension in the subject is the same one every correspondence system has. If the spine really answers to the calendar and the intestines really answer to the Yangtze, a reader wants to know what the correspondence is doing — whether it constrains anything, or whether it names resemblances after the fact. The woman's cycle exception cuts both ways here. It is honest about the limit, and it also shows how cheaply a mismatch can be absorbed.
Open: the chain from letting go to clarity to stillness has no timescale anywhere on it. The nearest quantities in the corpus are elsewhere.
Take the correspondence map seriously and you get a way of living that's genuinely different. You watch the season, and four o'clock in February stops being the same room as four o'clock in June. A discomfort gets read as weather before it gets read as illness. You stop treating your own body as a machine that ought to behave identically every day.
Take the non-imitation rule seriously and something is removed instead. Everything you might have done with that map is now forbidden. You cannot run the circulation deliberately, you cannot time your practice to the trigram in your skull, you cannot use any of it. The map becomes a thing you consult after the fact and never a thing you act on.
The two together produce an unusual position: detailed knowledge held specifically so that it can be not used. Elsewhere in this corpus the same shape appears — the Zen school knowing all about the channels and refusing to discuss them, on the grounds that discussion makes people chase. Here the refusal is one step further in. You are told the map, told it is true, and told that acting on it is the error.
What the text does not settle is why you were given the map at all, if the correct response to it is inaction. The best answer available is the diagnostic one in the case study — you need it to read what happens, not to cause it — and the text never says this outright.
The Extreme of Yin Gives Birth to Yang — that page finds the one undosed sentence the whole framework hangs from: stillness carried far enough produces activity by itself. Here that sentence is doing a job, and the job is to forbid something rather than to prescribe it. A shaky causal claim is dangerous when it prescribes an action, because whatever happens next gets credited to the action. The same claim telling you to stop is much harder to abuse — sitting still can't manufacture evidence for itself. So the weakest link in this system happens to point in its safest direction, which is luck rather than design, and it's worth knowing which way the other weak links point.
Three Elixir Fields Beat Seven Chakras — that page has a coarser map defended as better instruction, because every named point is somewhere attention can stick. Wei Bo-yang's map runs the opposite way: it is extremely fine-grained, and it is explicitly not to be used as a place to put attention. So the corpus holds two maps with opposite resolutions and opposite jobs. Reading them together gives a rule that neither states — the granularity of a body map should be set by what you intend to do with it, and a map you are forbidden to act on can afford detail that a map for beginners cannot.
Sharpest implication. The most influential correspondence system in Chinese cultivation was written by a man who said the correspondences run by themselves, and the whole modern industry of guided energy circulation does precisely what he ruled out. The map survived and the instruction attached to it didn't. Which other maps in this corpus have lost their riders the same way is a question worth putting to every one of them.
Generative questions.
If mental holding is what bends the flows, what counts as holding? The text separates it from thinking, since thoughts are allowed to arise. But it never says what the felt difference is between having a thought and gripping one, and that difference is the whole practice.
The woman's-cycle exception says each person is her own small universe. Taken seriously, that undercuts the standard pattern for everybody, not only for women — so how much of the map is meant to be individual, and what would be left if it all were?