The Eight Trigrams

魂 Hun and 魄 Po

Classical Chinese thought already treats the person as double in more than one way. In medical and Daoist language, Hun (魂) is the lighter, planning, image-bearing aspect linked with the liver and with Heaven; Po (魄) is the denser, breath-bound, immediately responsive aspect linked with the lungs and with Earth.

This framework integrates that distinction as the final split of the descent. Hun becomes the Projective mode of psyche: meaning, interpretation, vision, symbolic extension. Po becomes the Connective mode of psyche: contact, affect, instinct, embodiment, and immediate registration.

How A Trigram Is Built

Each trigram is a stack of three yin and yang lines. In this system, the three lines are read through the three differentiations already established in the descent:

Bottom line: Assertive / Receptive
Middle line: Native / Directive
Top line: Projective / Connective

Read classically, the three lines are also Earth, Human, and Heaven. Read microcosmically, they show how a universal principle becomes a human tendency and then a lived mode of experience.

八卦成列，象在其中矣。
The eight trigrams stand in ordered array, and the images are within them.

— Xici Zhuan

Traditionally, the trigrams are often listed in the sequence:

Qian, Dui, Li, Zhen, Xun, Kan, Gen, Kun
Heaven, Lake, Fire, Thunder, Wind, Water, Mountain, Earth

That sequence matters because it shows the Bagua as a complete set rather than eight isolated symbols.

Earlier Heaven And Later Heaven

The tradition preserves more than one arrangement of the eight trigrams. The two most important are the Earlier Heaven (先天, Xiantian) arrangement associated with Fuxi and the Later Heaven (後天, Houtian) arrangement associated with King Wen.

Earlier Heaven presents the trigrams as primordial order: balanced oppositions, structural relations, the pattern before events become concrete.
Later Heaven presents the trigrams as manifest order: seasons, directions, movement in lived time, the world as process and situation.

This site mainly uses the trigrams in the second sense: as powers active in lived experience. But the first sense still matters. Without Earlier Heaven, the eight become mere personality labels. Without Later Heaven, they remain too abstract to describe real life.

One Symbol, Several Readings

The same trigram can be read from several angles without changing its identity:

As a universal principle: Heaven creates, Earth receives, Thunder moves, Wind penetrates, Water tests, Fire illuminates, Mountain stops, Lake opens.
As psychology: each trigram describes a stable style of perception, judgment, relation, or action.
As events: each trigram describes the kind of situation that is unfolding, such as a beginning, a shock, a pause, a deepening, or a yielding.
As typology: each trigram is one of the four dynamics expressed through either the Projective or Connective side of psyche.

The Eight As One Order

The trigrams, the powers, the organs, the planets, the ritual figures, and the event-patterns are all read here as one unified order. They are not separate systems stitched together afterward. They are different expressions of the same pattern as it appears in cosmology, psyche, body, fate, and practice.

Different traditions develop those correspondences differently, which is why exact assignments can vary by lineage. But the logic remains the same: the trigram is the root pattern, and the other correspondences are its unfoldings.

This is also why the esoteric personifications matter. When a trigram appears as an Immortal, a Bodhisattva, a ritual role, or a magical function, it is the same power being rendered mythically rather than abstractly.

	Trigram	Classical image	Four-dynamic parent	Power in this system
☰	Qian 乾 Heaven	Strength, initiation, creative authority	Tai Yang Assertive + Native	Wisdom expressed outward as vision and direction
☱	Dui 兌 Lake	Joy, exchange, openness	Tai Yang Assertive + Native	Vitality expressed outward as warmth and relation
☲	Li 離 Fire	Brightness, attachment, intelligibility	Shao Yang Assertive + Directive	Reason expressed outward as structure and articulation
☳	Zhen 震 Thunder	Arousal, movement, activation	Shao Yang Assertive + Directive	Force expressed outward as action and impact
☴	Xun 巽 Wind	Penetration, gradual influence, entry	Shao Yin Receptive + Native	Wisdom expressed inward as clarity and subtle perception
☵	Kan 坎 Water	Abyss, depth, testing, sincerity in danger	Shao Yin Receptive + Native	Vitality expressed inward as reserves, need, and potential
☶	Gen 艮 Mountain	Stillness, stopping, boundary	Tai Yin Receptive + Directive	Reason expressed inward as measure, limit, and judgment
☷	Kun 坤 Earth	Receptivity, support, bearing, completion	Tai Yin Receptive + Directive	Force expressed inward as endurance and transformation

The Four Families Of Powers

The eight trigrams also organize into four paired families. Each family shares the same human function, but expresses it through the Assertive or Receptive pole:

Wisdom: Qian and Xun
Reason: Li and Gen
Vitality: Dui and Kan
Force: Zhen and Kun

This is where the tradition and your interpretation meet most directly. The classical image gives the mode of expression; the system names the recurring human power moving through that image.

For example, Heaven and Wind both belong to Wisdom, but not in the same way. Qian is wisdom that initiates, declares, and sets direction. Xun is wisdom that enters, senses, and works by subtle influence. Thunder and Earth both belong to Force, but Zhen acts through impact while Kun acts through bearing and transforming what has been received.

三才 The Three Powers

立天之道曰陰與陽，立地之道曰柔與剛，立人之道曰仁與義。
They established the way of Heaven and called it yin and yang. They established the way of Earth and called it yielding and firm. They established the way of the Human and called it benevolence and righteousness.

— Shuo Gua (Discussion of the Trigrams)

The trigram is therefore not only a symbol. It is a compact grammar. It tells you what kind of power is operating, how it behaves, whether it is moving outward or inward, and what sort of event-pattern it tends to produce. The next section reads each trigram as one of the eight powers within that grammar.