Chapter 5: A Survey of the Schools (I): The Eight Mansions School

The Eight Mansions school is, among the schools of principle-and-qi, the one with the lowest threshold of entry and the widest popular circulation. It requires no complex chart-casting; one need only know the trigram of the house's sitting mountain and the occupant's life-gua, and consult a single mnemonic verse to fix the fortune or misfortune of all eight directions. It is precisely because of this simplicity that it has become the undisputed mainstream of popular fengshui literature—of the home fengshui books found in bookstores today, nine times out of ten they belong to the Eight Mansions system or one of its variants.

5.1 Origins and Transmission: The Bazhai Mingjing and the Yangzhai Sanyao

The traditional origin story attributes the Eight Mansions method to the Tang-dynasty monk Yixing (the legend that Chan Master Yixing devised the trigram cases "in order to confound foreign countries"), but this has no historical basis. What can be confirmed is that the lineage of methods dividing a house by the eight trigrams and determining fortune and misfortune by the transformation of the Roaming-Year lines can be traced back to the house classics among the Dunhuang manuscripts and to Song-dynasty books of yin-yang, and had already fully matured by the Ming: the method of calculation recorded under the heading "On the Great Roaming Years" in the Wanli-era Yangzhai Shishu is identical to today's Eight Mansions method. During the Qianlong reign of the Qing, the Daoist Ruoguan compiled the Bazhai Mingjing (attributed to Yang Yunsong), which became the fixed canonical text of this school; a little later, Zhao Jiufeng's Yangzhai Sanyao organized the judgment of yang dwellings under the "three essentials" of gate, master bedroom, and stove, and its underlying skeleton is likewise the Eight Mansions Roaming Years. In terms of its scholarly genealogy, the Eight Mansions school—which judges fortune and misfortune purely by trigram cases, relying solely on stars and trigrams without regard to mountain form—is precisely the direct descendant of the lineage Wang Yi called "the Fujian method" (the ancestral-temple method); hence in older texts, the Eight Mansions method is also called "the East-West Four Houses method" or "the Roaming-Year trigram-case method."

5.2 East Four and West Four: The Basic Classification of the Eight Mansions School

The Eight Mansions school divides the Later Heaven trigrams into two groups:

• The East Four: Kan, Li, Zhen, and Xun (belonging respectively to water, fire, wood, and wood);
• The West Four: Qian, Kun, Gen, and Dui (belonging respectively to metal, earth, earth, and metal).

The underlying logic of this grouping is Five-Phase affinity: within the East Four trigrams, water, wood, and fire generate one another in sequence (water generates wood, wood generates fire); within the West Four trigrams, earth and metal generate one another (earth generates metal); while between the two groups, wood overcomes earth, earth overcomes water, metal overcomes wood, and fire overcomes metal—generation and overcoming clash across the divide. In Ming-dynasty sources, the life-gua is also called the "fuyuan" (fortune-origin)—the Yangzhai Shishu opens with a section "On the Fuyuan," treating the cycle (East Four or West Four position) to which a person's birth year belongs as the very first principle in choosing a house, which shows the priority given to "matching person and house" within the Ming-dynasty Eight Mansions system; today's colloquial phrase "East Four life" or "West Four life" is simply the vernacular descendant of the fuyuan doctrine. From this follows the Eight Mansions school's first principle: East Four and West Four must not be mixed—a person of East Four life should live in an East Four house and open a gate in an East Four direction, while a person of West Four life should live in a West Four house and open a gate in a West Four direction; mixing the two brings a clash of generation and overcoming, and is held to be inauspicious.

A house is classified by its sitting mountain, which determines its trigram: sitting north (the three mountains ren, zi, gui) makes it a Kan house; sitting south, a Li house; sitting east, a Zhen house; sitting southeast, a Xun house; sitting northwest, a Qian house; sitting southwest, a Kun house; sitting northeast, a Gen house; and sitting west, a Dui house. A person is classified according to their life-gua (see 5.4).

5.3 The Eight Roaming-Year Stars and the Great Roaming Years Verse

The engine of fortune and misfortune within the Eight Mansions school is the Eight Roaming-Year Stars: taking the palace occupied by the house's trigram (or a person's life-gua) as "Reclining Position," the remaining seven stars are distributed across the other seven palaces according to a fixed mnemonic verse. The names of the eight stars, their corresponding Nine-Star names, and their auspicious or inauspicious rank are as follows:

The formula for their distribution is the famous Great Roaming Years verse:

Qian: six, heaven, five, calamity, cutoff, prolonged, life. Kan: five, heaven, life, prolonged, cutoff, calamity, six. Gen: six, cutoff, calamity, life, prolonged, heaven, five. Zhen: prolonged, life, calamity, cutoff, five, heaven, six. Xun: heaven, five, six, calamity, life, cutoff, prolonged. Li: six, five, cutoff, prolonged, calamity, life, heaven. Kun: heaven, prolonged, cutoff, life, calamity, five, six. Dui: life, calamity, prolonged, cutoff, six, five, heaven.

How to read it: the first character of each line names the palace where Reclining Position sits; the seven characters that follow (six = Six Killings, heaven = Heavenly Physician, five = Five Ghosts, calamity = Calamity Harm, cutoff = Death Cutoff, prolonged = Prolonged Life, life = Life Qi) are placed in sequence into the remaining palaces, following the fixed palace order Qian-Kan-Gen-Zhen-Xun-Li-Kun-Dui (skipping the home palace itself). Expanding all eight lines yields the complete Eight Mansions Roaming-Year table:

Examining this table reveals the inner structure of the Eight Mansions model: the four auspicious stars (Life Qi, Prolonged Life, Heavenly Physician, Reclining Position) always fall into the four palaces belonging to the same group as Reclining Position (whether East Four or West Four), while the four inauspicious stars always fall into the four palaces of the opposite group—the principle that "East and West must not mix" thus holds automatically at the level of the star chart itself. Moreover, the pairing of the stars is perfectly symmetrical (Qian and Kun are Prolonged Life to each other, Kan and Li are Prolonged Life to each other, Qian and Dui are Life Qi to each other, and so on)—the entire system is, in effect, an encoding of fortune and misfortune based on the Earlier Heaven trigrams' relations of line-change (one line changed, two lines changed, three lines changed), and its mathematical structure is remarkably tidy.

5.4 The Life-Gua, and the Gate, the Master Bedroom, and the Stove

The life-gua is derived from a person's birth year (traditionally with the Beginning of Spring as the boundary marking the start of the year). The common simplified calculation is:

• Born 1900–1999: for males, the life-gua number = (100 minus the last two digits of the birth year) mod 9; for females, the life-gua number = (the last two digits of the birth year minus 4) mod 9.
• Born 2000 or later: for males, the life-gua number = (99 minus the last two digits of the birth year) mod 9; for females, the life-gua number = (the last two digits of the birth year plus 6) mod 9.
• A remainder of 0 is always counted as 9. The gua numbers correspond to the trigrams: 1-Kan, 2-Kun, 3-Zhen, 4-Xun, 6-Qian, 7-Dui, 8-Gen, 9-Li; a result of 5 is assigned to Kun for males and to Gen for females.

Example: for a male born in 1980, 100 − 80 = 20, and 20 mod 9 = 2, so the life-gua is Kun (a West Four life); for a female born the same year, 80 − 4 = 76, and 76 mod 9 = 4, so the life-gua is Xun (an East Four life)—born in the very same year, a man and a woman can have different life-guas, and it is extremely common for a married couple's life-guas to fall into opposite East Four and West Four groups. The Eight Mansions school's traditional answer to this is to "take the head of household (or, as a conciliatory compromise, assign each bedroom according to its own occupant) as the standard"—a solution that is itself a point of dispute within the school.

Operationally, the Eight Mansions school organizes its judgments around the Yangzhai Sanyao's gate, master bedroom, and stove:

• The gate is the mouth through which qi is taken in, and is the most important of the three. It should be opened in the house's (or the occupant's) Life Qi, Prolonged Life, or Heavenly Physician direction.
• The master bedroom refers to the largest and most prominent main room of the house (in modern practice, this is generally taken to be the master bedroom). It should be located in one of the four auspicious directions, in mutual generation and harmony with the gate.
• The stove is judged by both its "sitting" and its "facing": the base of the stove should sit pressed against an inauspicious direction (using fire to suppress the inauspiciousness), while the stove's fire-mouth (the opening for feeding fuel, or the cook's working side) should face an auspicious direction (taking in auspicious qi as it enters the food). "Sitting inauspicious, facing auspicious" is the master formula for stove placement.

In addition, the bed, the desk, and the household shrine should be placed in auspicious directions, while the bathroom and storage areas should be pressed into inauspicious directions—"the auspicious directions should be active and put to use, the inauspicious directions should be kept quiet and suppressed" is the general rule of Eight Mansions layout.

Beyond the commonly practiced Eight Mansions method, the Yangzhai Shishu and Bazhai Mingjing system preserve several accompanying techniques that are mostly overlooked today, and which this survey records for the sake of completeness. First, the classification of house shapes and the Piercing-the-Palaces Nine Stars: the old method divided houses into still houses (a single courtyard), moving houses (two to five courtyards in sequence), transforming houses (six to ten courtyards), and metamorphosing houses (eleven or more courtyards); for a multi-courtyard house, judgment was not made with a single Roaming-Year chart for the whole property, but rather by the method of "piercing the palaces," which distributes the nine stars courtyard by courtyard in succession—one star per courtyard, changing progressively layer by layer, so that the front and rear courtyards along the same central axis could carry different fortunes. This algorithm, designed for the deep multi-courtyard mansion, has become nearly a lost art as traditional courtyard architecture has disappeared, but it reminds us that the Eight Mansions method was originally tailored to a specific architectural form; applying it directly, unchanged, to a single three-bedroom unit in a modern apartment building has, in effect, already substituted a different object for the one it was designed for. Second, the drainage method: the direction of a house's interior drainage outlet carries its own set of auspicious and inauspicious rules keyed to the sitting-and-facing, logically related to the Sanhe school's water-outlet doctrine, and represents an area of overlap between the Eight Mansions and Sanhe schools in yang-dwelling practice. Third, taboos on construction by year and fate: the year in which construction or renovation begins carries its own checklist of clashes and harmonies between the occupant's year-fate and the year's Tai Sui and Three Killings, linking the date-selection system into the Eight Mansions framework. Taken together, these details show that the Ming-Qing Eight Mansions method was in fact a toolbox organized around "trigram cases as the trunk, with various auxiliary techniques attached"—far richer than the simplified version found in today's popular literature, which amounts to little more than "look up your life-gua and check the auspicious direction."

One further, frequently asked point of operative divergence is worth recording: whether the Roaming Years should be cast from the house or from the gate. The common method fixes the house's trigram from the sitting mountain and casts Reclining Position from the sitting mountain (as described in this chapter); but another lineage (the so-called "fixing the house by the gate") holds that Reclining Position should be cast from the direction of the front gate, so that changing the gate changes the entire star chart. The two methods generally yield different auspicious and inauspicious directions, and both positions appear side by side in Ming-Qing sources; present-day practitioners likewise follow one or the other. This third point of divergence within the Eight Mansions school (the first two being: how rigidly East Four and West Four must not be mixed, and whether the house or the person's life-gua takes priority) means that this supposedly simplest of schools in fact possesses no fewer than four mutually different operative versions.

5.5 A Worked Example: The Eight Mansions Judgment of a Kan House

Take a house sitting zi and facing wu (sitting north, facing south)—that is, a Kan house (an East Four house). Consulting the Kan-house row of the Roaming-Year table: Xun (southeast) is Life Qi, Li (south) is Prolonged Life, Zhen (east) is Heavenly Physician, and Kan (north) is Reclining Position—these are the four auspicious directions; Kun (southwest) is Death Cutoff, Gen (northeast) is Five Ghosts, Qian (northwest) is Six Killings, and Dui (west) is Calamity Harm—these are the four inauspicious directions.

On this basis, the Eight Mansions master's ideal layout would be: the front gate opened at the southeast corner (the Life Qi gate, the single most auspicious gate for a Kan house) or due south (the Prolonged Life gate); the master bedroom in the south or east; the stove's base pressed into the southwest Death Cutoff direction with its fire-mouth facing the southeast; and the bathroom pressed into the northeast Five Ghosts or northwest Six Killings direction. Conversely, if this house's front gate were opened at the southwest corner, it would be a "Death Cutoff gate," and an Eight Mansions master would judge it a house prone to illness and financial loss, recommending that the gate be changed or that the space be left unused for the long term.

Now introduce the human variable: suppose the head of household is a man born in 1980, with a Kun life-gua (a West Four life). A Kun-life person living in a Kan house—consulting the Kun life-gua's Roaming Years (the same as the Kun-house row of the table)—finds that the Kan direction is precisely this person's Death Cutoff. This produces a direct clash between two conventions within the Eight Mansions school itself: the faction that prioritizes the house (the tendency of the Yangzhai Sanyao) holds that as long as the house sits East Four and the gate, master bedroom, and stove are well matched to it, the arrangement is auspicious, with the life-gua serving only as a secondary reference; the faction that prioritizes the person's fate (the Bazhai Mingjing's tendency toward "Roaming Years by life-gua") would instead judge this a case of "house and fate clashing," recommending at minimum that the occupant place the bed within the house in a direction auspicious to their own life-gua (a Kun-life person might, for instance, take a bedroom in the southwest or northwest), or at worst advising a change of residence altogether. The very same house, judged under the very same body of Eight Mansions theory, can thus swing anywhere from "supremely auspicious" to "greatly inauspicious"—this internal disagreement is one of the threads set up for the comparative case study in Chapter Ten.

5.6 Brief Assessment and Principal Criticisms

The strength of the Eight Mansions school lies precisely in its simplicity: few variables (the house's trigram and the person's life-gua), tidy and symmetrical rules (the line-change symmetry), and no need for any calculation of cyclical periods—an ordinary person can pick it up and check their own case in half a day, and this is the fundamental reason it dominates the popular-literature market. Criticism of it centers on four points.

First, its resolution is far too low. Every house in the world falls into only eight categories, and every person into only eight categories as well (in practice, because of the assignment for a gua-number of 5, there are only eight categories each for men and women); tens of millions of houses sharing the same sitting-and-facing, and tens of millions of people born in the same year, are all assigned identical fortunes—a stark contrast with fate calculation's finer tradition that "even those born in the same year, month, day, and hour do not share an identical fate." Second, it has no temporal dimension. Once an Eight Mansions chart is cast, it never changes across a hundred years, which cannot account for the common experience of "the same house being auspicious at first and then turning inauspicious"; Xuankong practitioners for this reason mock Eight Mansions as "a dead method." Third, the life-gua considers only the birth year, disregarding the month, day, and hour, making its sampling far too coarse; and the design by which men and women receive different guas even when born in the same year (5.4) lacks any theoretically self-consistent explanation. Fourth, its textual sources are of late origin yet claim excessive antiquity—the Bazhai Mingjing is attributed to Yang Yunsong but was in fact compiled by a Qing-dynasty author, and its scholarly genealogy is in fact far less clear than its own operative mnemonics. On balance: the Eight Mansions school occupies a legitimate niche as an "entry-level" model, and its layout logic of "activate the auspicious directions, suppress the inauspicious ones" has been widely borrowed by other schools as well; but within the pecking order internal to the principle-and-qi tradition, it has long occupied the lower rungs—and this pecking order is itself part of the social history of the principle-and-qi school.