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I Ching Birth Hexagram · Hexagram 58 of 64

Hexagram 58, 兌 Duì: two lakes that feed each other

兌 Duì is the lake trigram doubled: in each half one broken line lies open on two whole ones, as a lake lies on firm ground. The character means gladness, and also exchange, and the tradition reads the hexagram as openness and the joy of good company, with a firm centre that keeps pleasure from becoming flattery.

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Hexagram 58, 兌 Duì, drawn as six lines numbered from the bottom: whole, whole, broken, whole, whole, broken. The lower, inner trigram is 兌 Duì, Lake; the upper, outer trigram is 兌 Duì, Lake. 1 2 3 4 5 6 Upper, outer 兌 Duì, Lake Lower, inner 兌 Duì, Lake 58 兌 Duì Lines numbered from the bottom
The figure of 兌 from the bottom line up: Lake inside, Lake outside. Two broken lines, four whole.

Facts

Number
58 of 64, in the received order
Character and pinyin
兌 Duì ䷹
Our title
Openness
Lines, bottom to top
yang, yang, yin, yang, yang, yin
Lower trigram (inner)
☱ 兌 Duì, Lake
Upper trigram (outer)
☱ 兌 Duì, Lake
Within (nuclear)
37 家人 Jiā Rén, The Household
King Wen pair
57 巽 Xùn, Entering Wind
Legge's name (1882)
Tui
Part of the text
The second part (下經), 31 to 64

Meaning

Two lakes side by side keep each other full: that is the Image, and it is the hexagram's whole idea. 兌 is the trigram of the youngest daughter and of the mouth, and its virtue in the Shuogua is 說, to be pleased, which is also the old way of writing to speak; the tradition hears gladness and exchange together. The Judgment promises progress on the condition of firmness, which the commentary reads as the whole lines inside each trigram, a firm centre under an open face. It is the one trigram for which the Shuogua names a season: autumn.

The Image is two lakes, one above the other, and the superior man gathers his friends to talk and to practise together. In our own reading, 兌 is gladness that comes from good company and an open manner, and the line texts draw the line between harmony and the pleasure that is bought or chased.

The lines

The first line is "the pleasure of (inward) harmony", in Legge's words, and the second pleasure that comes from sincerity. The third draws pleasure towards itself, and it goes badly; the fourth weighs what to take pleasure in and is uneasy, and escaping harm brings joy. The fifth trusts one who would harm it. The top line takes its pleasure in leading others on.

Its pair is 巽, hexagram 57; within 兌 lies 家人, hexagram 37, and every line flipped gives 艮, hexagram 52, stillness.

In the birth cast

The time cast arrives at 兌 when the year, month and day leave 2 on eight, which puts 兌 lake above, and the same total with the hour added leaves 2, which puts 兌 lake below. Which line moves depends on what the whole total leaves on six, and each line turns the figure into a different hexagram:

  • Line 1 (初九) moving: becomes 47 困 Kùn, Confinement
  • Line 2 (九二) moving: becomes 17 隨 Suí, Following
  • Line 3 (六三) moving: becomes 43 夬 Guài, Breakthrough
  • Line 4 (九四) moving: becomes 60 節 Jié, Measure
  • Line 5 (九五) moving: becomes 54 歸妹 Guī Mèi, The Younger Sister Weds
  • Line 6 (上六) moving: becomes 10 履 Lǚ, Treading

Lines 2 to 5 give the hexagram within, 37 家人 Jiā Rén, The Household. Everyone born in the same lunar day and double hour has the same cast, so the figure describes a moment, not a person.

Correspondences

Each item with how it stands: “sourced” is in the work cited, “our construction” is EsoTerrier’s own, and “disputed” means the sources disagree.

Trigram virtues (Shuogua, chapter 7)
兌 pleased, open, doubled, in our English sourced
Trigram family places (Shuogua)
youngest daughter, doubled sourced
Trigram body and animal images (Shuogua)
mouth and sheep, doubled sourced
Trigram phases (a classical correspondence: the Plum Blossom text's table)
Metal, doubled. The Han assignment of 梅花易數, book 1, also used by Jing Fang; not stated as such in the Zhouyi sourced
Inverse and opposite
Upside down: 57 巽 Xùn, Entering Wind; every line flipped: 52 艮 Gèn, Stopping sourced
Human Design gate
Gate 58, from 273.875° to 279.5° of the tropical zodiac on Ra Uru Hu's wheel (1987): a modern placing, not the I Ching's sourced
Our English title
Openness: EsoTerrier's own, from the sense of 兌 our construction

How the schools read it

The Zhouyi, in Legge's translation (1882)
“Tui intimates that (under its conditions) there will be progress and attainment. (But) it will be advantageous to be firm and correct.”
The Image (大象), one of the Wings, in our paraphrase
Two marshes, one above the other; the superior man encourages the conversation of friends and their shared practice.
The Plum Blossom method (Ming)
A figure reached by numbers: 兌 above when the year, month and day leave 2 on eight, 兌 below when the same total with the hour leaves 2.
Human Design (Ra Uru Hu, 1987)
Takes the number for its gate 58 and puts it on the zodiac; its own reading, which we do not quote.
EsoTerrier
Lake upon lake: open exchange and the gladness of good company, friends talking and learning together; gladness with a firm centre holds, and pleasure pursued for itself does not.

Claims about it

  • Gate 58 of Human Design, at 273.875° to 279.5° of the zodiac, is where the I Ching itself places hexagram 58.

    false

    What the record shows: The wheel is Shao Yong's circle rotated by Ra Uru Hu in 1987 to 1989 so that hexagram 41 starts at 2° Aquarius. No Chinese source we found puts the hexagrams on degrees of the zodiac.

  • Being born under 兌 Duì fixes a person's character.

    unverified

    What the record shows: A modern reading with no source in the tradition. The Zhouyi has no birth hexagram; the cast reads a figure, not a person, and everyone born in the same lunar day and double hour shares it.

Elsewhere on EsoTerrier

Sources

Primary texts (6)
  1. James Legge (trans.), The Yî King, Sacred Books of the East XVI. Oxford: Clarendon Press, 1882. Public domain; quoted briefly and credited. en.wikisource.org/wiki/Sacred_Books_of_the_East/Volume_16
  2. 梅花易數 (Meihua yishu, the Plum Blossom method), attributed to Shao Yong, book 1: the time rule, the trigram numbers and phases, and the casts of the plum blossom and the peonies. zh.wikisource.org/wiki/梅花易數/卷一
  3. 周易 (Zhouyi), the received Chinese text of the hexagram and line statements with the Ten Wings. ctext.org/book-of-changes
  4. The same, the 1882 Oxford edition scanned (archive.org), for hexagrams 33 to 64 and the appendices. archive.org/details/sacredbooksofchi16conf
  5. The Unicode Standard, Yijing Hexagram Symbols, U+4DC0 to U+4DFF. unicode.org/charts/PDF/U4DC0.pdf
  6. 京氏易傳 (Jingshi yizhuan), attributed to Jing Fang, three books. zh.wikisource.org/wiki/京氏易傳
Studies and other sources (3)
  1. "King Wen sequence", Wikipedia. en.wikipedia.org/wiki/King_Wen_sequence
  2. Jovian Archive, "Gates and hexagrams in Human Design" (cited for the wheel's origin only). jovianarchive.com/pages/gates-and-hexagrams-in-human-design
  3. "Hexagram (I Ching)", Wikipedia. en.wikipedia.org/wiki/Hexagram_(I_Ching)
Our own research (5)
  1. EsoTerrier, I Ching research, 10 to 14 October 2026: the method, the validation (61 births), the variants and the lists.
  2. EsoTerrier calculation engine, the I Ching service and its reference tables (titles, glosses and readings our own).
  3. EsoTerrier, Gene Keys research, 9 October 2026: the legal and trade-mark report, on which hexagram names are free to use.
  4. EsoTerrier, Human Design research, 9 October 2026: the wheel, gate 41 at 2° Aquarius, 5.625° per gate.
  5. EsoTerrier, engine audit of 14 October 2026: the reworded titles, readings and trigram qualities, with the passages each rests on.

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By EsoTerrier. Written with AI assistance from our research and checked against its sources; last revised 19 October 2026. How we write these pages.

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