◆ Chinese metaphysics · Tang Dynasty
Feng Shui
You are arranging your bedroom or office in an existing home
Feng Shui vs Xuan Kong Da Gua
Feng Shui and Xuan Kong Da Gua (玄空大卦, often abbreviated XKDG) are both spatial-energetic disciplines from Chinese metaphysics, but they operate at radically different resolutions. Classical Feng Shui — specifically the Ba Zhai (八宅, 'Eight Mansions') school — divides space into 8 directional sectors and matches a person's Kua number to their four favorable and four unfavorable directions. XKDG, a Yuan Kong (玄空) school refinement that became influential in late-Qing-dynasty practice, divides space into 64 hexagram mountain-water pairings and times the analysis through 20-year Period cycles. Ba Zhai answers 'where should I face?' XKDG answers 'which 64-hexagram configuration is this property running, and how does that interact with the Period?' Different granularity, different problem class.
◆ Feng Shui branch
Xuan Kong Da Gua
You are buying or building a property and can choose its sitting/facing direction
Key Differences
◆ 5 points- Ba Zhai is person-centric: two people in the same house may have different favorable directions because their Kua numbers differ. XKDG is property-centric: the hexagram pair belongs to the building, not the occupant — anyone living there inherits the same diagnosis.
- Ba Zhai gives the same answer in 1990 and in 2030. XKDG actively re-evaluates because the Period rotates: a hexagram auspicious in Period 8 (2004-2023) may turn unfavorable in Period 9 (2024-2043). This is the classical "time and space inseparable" principle (玄空 literally "mystery and emptiness", but interpreted as "time and space").
- Ba Zhai uses 8 directional sectors (each 45° wide). XKDG uses 64 hexagram positions (each ~5.625° wide on the compass) — eight times finer. Most modern home interiors are too small for XKDG-grain placement; XKDG shines for property selection and large-property arrangement.
- Ba Zhai is teachable in an afternoon; XKDG requires fluent classical-Chinese hexagram vocabulary plus knowledge of the three Yuan (上元/中元/下元) and the period replacement rules. The educational gap is part of why XKDG remains a senior-practitioner discipline.
- Ba Zhai has well-defined remediation (move the bed, reorient the desk, place a metal object in the wood-affliction direction). XKDG remediation is structural — you usually cannot fix a wrongly-facing house except by buying a different property or doing major construction. The systems differ on how reversible their diagnoses are.
When to Use Each System
◆ Side-by-sideChoose Feng Shui when
- You are arranging your bedroom or office in an existing home
- You want a per-person directional reading (best/worst direction to face)
- You need a tractable analysis without classical-Chinese specialist knowledge
- You are matching multiple family members to different rooms in a house
Choose Xuan Kong Da Gua when
- You are buying or building a property and can choose its sitting/facing direction
- You are dating a yin zhai (burial site) for ancestral feng shui
- You are selecting an opening/move-in date and want hexagram-Period harmonisation
- You already have a Ba Zhai analysis and want a higher-resolution second pass
Side-by-Side Comparison
◆ 7 dimensions| Aspect | Feng Shui | Xuan Kong Da Gua |
|---|---|---|
| School lineage | Ba Zhai (Eight Mansions), formalized by Yang Yun-song (~9th c. CE Tang Dynasty) | Xuan Kong Da Gua, attributed to Jiang Da-hong and refined by Shen Zhu-reng (Qing Dynasty 17th-19th c.) |
| Spatial granularity | 8 sectors (45° each) based on the Eight Trigrams (Bagua) | 64 mountain hexagrams × 64 facing-water hexagrams = 4,096 mountain-water pairings |
| Personalization input | Personal Kua number derived from birth year + gender (one number per person) | Property sitting/facing direction + Period of construction (no per-person calculation) |
| Time treatment | Largely static — your favorable directions do not shift across decades | 20-year Period cycles (currently Period 9, 2024-2043) actively rotate hexagram auspiciousness |
| Output | 4 favorable directions (Sheng Qi, Tian Yi, Yan Nian, Fu Wei) + 4 unfavorable (Jue Ming, Wu Gui, Liu Sha, Huo Hai) | Hexagram pair classification (上元/中元/下元 zodiac alignment, replacement, period-in-period combos) |
| Typical use case | Matching a person to a home, choosing the bed/desk direction, sleeping head-direction | Selecting a property by sitting/facing direction, dating burial sites (yin zhai), construction date selection |
| Overlap with Flying Stars | Independent — Ba Zhai works with personal Kua, Flying Stars with annual/period stars | Often used alongside Flying Stars by senior practitioners; XKDG provides finer hexagram-grain over Flying Stars 9-palace grid |
How K A X A N T A Combines Both
K A X A N T A computes both a Ba Zhai personal-Kua reading and the XKDG hexagram-pair diagnosis for a given property. ADR-0001 Axis 4 (ENVIRONMENT) makes Feng Shui the primary authority on spatial questions, with XKDG providing higher-resolution refinement when the question requires it. The synthesis rule: Ba Zhai answers 'which way should I face?' for everyday placement, and XKDG answers 'is this property's hexagram running well in the current 20-year Period?' for large structural decisions. The two never genuinely conflict because they answer different sub-questions inside the same axis.
Frequently Asked Questions
Can I just use Ba Zhai and ignore XKDG?
For most everyday spatial decisions in an existing home, yes. Ba Zhai gives you 90% of the value for 10% of the complexity — bed direction, desk orientation, and room assignment can all be solved with a personal Kua. XKDG matters most when you are choosing between properties, scheduling major construction, or doing high-stakes commercial real estate decisions where the property-Period interaction is large enough to matter.
Do Ba Zhai and XKDG ever give conflicting recommendations?
Rarely, because they answer different questions. Ba Zhai tells you which direction within a room to face; XKDG tells you whether the property as a whole is well-configured. If your personal Sheng Qi direction inside a Ba Zhai-favorable room happens to face an XKDG-unfavorable hexagram on the larger compass, the senior-practitioner reading is to honor the property-level diagnosis (XKDG) for placement of immovable structures and the personal-level diagnosis (Ba Zhai) for moveable furniture. K A X A N T A's synthesis applies this same rule.
Why did the audit say XKDG only has 6 pages on the site?
XKDG covers a 64-hexagram space, and our current /guide/xuan-kong-da-gua/ content focuses on six high-yield application areas (sitting-facing calculation, hexagram compatibility, property audit, renovation sequencing, business premises, and burial feng shui) rather than per-hexagram interpretations. We are expanding the /guide/ tree by an 8-trigram-pair taxonomy to add depth where users will actually search — without flooding the index with 64 thin per-hexagram pages.
Why Choose? Get Both.
K A X A N T A calculates Feng Shui, Xuan Kong Da Gua, and seven other wisdom traditions — then synthesizes them into one unified cosmic blueprint.
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