BAZI KNOWLEDGE BASE
What Is Earth on the Wall (壁上土) in BaZi?
Earth on the Wall is the earth-class Nayin (a separate named element classification for a complete pair of chart symbols) assigned to 庚子 and 辛丑. San Ming Tong Hui pictures a wall that depends on beams and supporting ground, protects a dwelling from weather, and responds differently to named woods, earths, waters, fires, and metals; the image does not prove safety, property, defensive character, or ordinary earth strength.
What does Earth on the Wall establish first?
Earth on the Wall is the Nayin name for a complete 庚子 or 辛丑 pillar, and its Nayin phase is Earth. It may occur in the Year, Month, Day or Hour Pillar (the two-symbol column for the birth hour). The lookup unit is always one stem–branch pair in the same pillar, never a single character or a cross-pillar combination.
This lookup establishes one historical classification. 庚 remains a Metal stem and 子 a Water branch; 辛 remains a Metal stem and 丑 a Earth branch. Nayin Earth does not overwrite those ordinary Five-Phase facts.
How can you check for Earth on the Wall?
Read each complete pillar in an already calculated chart. A pillar that is exactly 庚子 or 辛丑 has the Earth on the Wall Nayin. One matching character, a zodiac animal or a real-world object is insufficient.
| Complete Jiazi | Stem phase | Branch phase | Nayin name | Nayin phase |
|---|---|---|---|---|
| 庚子 | Metal | Water | Earth on the Wall | Earth |
| 辛丑 | Metal | Earth | Earth on the Wall | Earth |
Worked example: how should a 庚子 Year Pillar be recorded?
Suppose the Year Pillar (the two-symbol column for the birth year) is 庚子. The table returns Earth on the Wall. A clear record says: Year 庚子; stem 庚 is Metal, branch 子 is Water; Nayin is Earth on the Wall, classed as Earth. This keeps the Nayin field separate from ordinary elemental data.
If 辛 appears only in the Month Pillar (the two-symbol column for the birth month) and 丑 only in the Day Pillar (the two-symbol column for the birth day), they do not form the same-pillar 辛丑 combination and do not create Earth on the Wall. Complete pairing comes before image interpretation.
Why does the source use the name Earth on the Wall?
San Ming Tong Hui describes wall earth that leans on beams, forms doors, and shelters a dwelling from heat, cold, frost, and snow. It requires a supporting ground, treats 子午 as named central pillars, and distinguishes framing wood from wood damaged by clashes or unsupported by earth. Roadside Earth bears the wall, while House and City-Wall Earth may protect it. Fire is generally difficult and may need specified water relief; Heavenly River and Well-Spring waters are not interchangeable, Gold Foil decorates only with wood present, and Sword Edge Metal may damage the wall. Name the beam, bearing earth, and clash conditions. Do not reduce the passage to “earth controls water” or “fire produces earth.”
What value does Earth on the Wall offer a modern reader?
Its practical value is precise lookup: 庚子 and 辛丑 share this Nayin name, which lets you locate the pair’s distinctive source image and conditions. If another pillar enters an older rule, record that full Jiazi, its location and the source before drawing a comparison.
Keep the reading order explicit: verify calendar inputs and the Four Pillars; retain stems, branches and hidden stems; evaluate Month Command and Day-Master structure; only then add Earth on the Wall as a Nayin layer. One Nayin name does not determine strength, Useful God, personality, work, relationships, wealth, health or event timing.
Continue reading
- Complete table of the thirty Nayin
Return to the sixty-Jiazi sequence and verify neighboring pairs.
- Compare another Earth Nayin: Roadside Earth
A shared phase does not make two images or conditions interchangeable.
- Earth in ordinary Five-Phase analysis
Separate Nayin classification from actual chart relations.