The Eight Trigrams
BĀGUÀ · 八卦 · THE BUILDING BLOCKS OF THE I CHING
KEY TAKEAWAYS / TL;DR
- ◈The Bagua (八卦) are eight three-line symbols — each a unique combination of Yin (⚋) and Yang (⚊) lines — that represent eight fundamental symbolic patterns in nature.
- ◈Two trigrams stacked together (6 lines total) create a hexagram (卦). All 64 hexagrams of the I Ching are derived from the 8 × 8 = 64 possible combinations of these trigrams.
- ◈The Bagua is applied across metaphysics: the I Ching uses them to organize hexagram readings, Feng Shui maps them to spatial directions, and Bazi associates them with familial archetypes and elemental symbolism.
ORIGIN & HISTORY
According to legend, the mythical emperor Fu Xi (伏羲) observed patterns in the natural world — the markings on a turtle shell, the flow of rivers, the movement of stars — and codified them into the eight trigrams around 3,000 BCE. Each trigram captures a fundamental dynamic of the universe in three binary digits.
King Wen of Zhou (周文王, c. 1050 BCE) later doubled the trigrams by stacking two together, producing the 64 hexagrams and authoring the judgments that form the core text of the I Ching. His son, the Duke of Zhou, added line-by-line commentaries, completing the classical structure we use today.
There are two primary arrangements of the Bagua: the Earlier Heaven (先天八卦, Fu Xi arrangement), depicting the ideal cosmic order as pure abstract opposites, and the Later Heaven (后天八卦, King Wen arrangement), mapping the trigrams to practical compass directions and seasonal cycles used in Feng Shui.
STRUCTURE
Each trigram is built from exactly three lines, read from bottom to top. Since each line can be either Yang (⚊) or Yin (⚋), there are 2³ = 8 possible combinations — hence the "Eight Trigrams" (八卦).
When two trigrams are stacked (one as the inner/lower trigram, one as the outer/upper trigram), they form a hexagram with 6 lines. The lower trigram represents the internal situation; the upper trigram represents the external environment. Their interaction helps describe the dynamics of the queried situation.
THE EIGHT TRIGRAMS
Qián — Heaven / Creative
Pure Yang · Metal · Father · NW · Head · Horse
Three solid Yang lines — concentrated creative force. Represents heaven, authority, the patriarch, and forward drive.
Kūn — Earth / Receptive
Pure Yin · Earth · Mother · SW · Abdomen · Ox
Three broken Yin lines — deep receptive force. Represents earth, nourishment, the matriarch, and broad acceptance.
Zhèn — Thunder / Arousing
Yang rising · Wood · Eldest Son · E · Feet · Dragon
One Yang line breaking through two Yin lines from below — an explosive burst of energy. Represents shock, initiative, and the first movement of spring.
Kǎn — Water / Abysmal
Yang trapped · Water · Middle Son · N · Ears · Pig
A single Yang line enclosed between two Yin lines — like strength trapped in danger. Represents peril, depth, hidden currents, and the need for caution.
Gèn — Mountain / Stillness
Yang on top · Earth · Youngest Son · NE · Hands · Dog
A Yang line resting on two Yin lines — movement that has voluntarily stopped. Represents meditation, boundaries, and knowing when to halt.
Xùn — Wind / Gentle
Yin below · Wood · Eldest Daughter · SE · Thighs · Rooster
A Yin line beneath two Yang lines — gentle penetration from underneath. Represents gradual influence, flexibility, and the effect of persistent softness.
Lí — Fire / Clinging
Yin inside · Fire · Middle Daughter · S · Eyes · Pheasant
A Yin line held between two Yang lines — brightness with emptiness at its heart. Represents clarity, beauty, attachment, and intellectual illumination.
Duì — Lake / Joyous
Yin on top · Metal · Youngest Daughter · W · Mouth · Goat
A Yin line sitting atop two Yang lines — openness and expression at the surface. Represents joy, communication, pleasure, and the effect of spoken language.
FROM TRIGRAMS TO HEXAGRAMS
The 64 hexagrams are generated by all possible upper-lower trigram pairings (8 × 8 = 64). For example:
Hexagram 1: 乾 (Qián) — The Creative. Pure Yang pattern. Six unbroken lines representing concentrated creative symbolism.
Hexagram 2: 坤 (Kūn) — The Receptive. Pure Yin force. Six broken lines representing deep nurturing acceptance.
Hexagram 63: 既济 (Jì Jì) — After Completion. Fire below Water — a balanced arrangement where each line is in its appropriate position.
Hexagram 64: 未济 (Wèi Jì) — Before Completion. Water below Fire — energies diverging, with the matter still unresolved. The I Ching ends here to frame completion as part of an ongoing cycle.
BAGUA IN FENG SHUI
In the Later Heaven arrangement (King Wen), each trigram occupies a compass direction. Feng Shui practitioners overlay this octagonal map onto floor plans to analyze energy flow:
- ◈South (☲ Fire / Li) — Fame, reputation, and visibility. Often represented with lighting, red tones, and triangular shapes.
- ◈North (☵ Water / Kan) — Work and life path. Often represented with water features, dark colors, and flowing shapes.
- ◈East (☳ Thunder / Zhen) — Family, vitality, and new beginnings. Often represented with green plants and wooden elements.
- ◈West (☱ Lake / Dui) — Children, creativity, and joy. Often represented with metallic objects and white/pastel tones.
| Trigram | Name | Nature | Element | Family | Direction | Body |
|---|---|---|---|---|---|---|
| ☰ | Qián | Pure Yang | Metal | Father | NW | Head |
| ☷ | Kūn | Pure Yin | Earth | Mother | SW | Abdomen |
| ☳ | Zhèn | Yang rising | Wood | Eldest Son | E | Feet |
| ☵ | Kǎn | Yang trapped | Water | Middle Son | N | Ears |
| ☶ | Gèn | Yang on top | Earth | Youngest Son | NE | Hands |
| ☴ | Xùn | Yin below | Wood | Eldest Daughter | SE | Thighs |
| ☲ | Lí | Yin inside | Fire | Middle Daughter | S | Eyes |
| ☱ | Duì | Yin on top | Metal | Youngest Daughter | W | Mouth |
Source: Wikipedia — Bagua; I Ching; Fu Xi; King Wen of Zhou