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I Ching Birth Hexagram · Hexagram 49 of 64

Hexagram 49, 革 Gé: fire in the lake, and the change whose day has come

革 Gé is hexagram 49 of the Zhouyi, which puts fire inside the lake: two elements that destroy each other until one gives way. The character is an animal's hide, and from there moulting and radical change; the Judgment says such a change is believed only once it has been carried through, and the Plum Blossom book's first cast begins here.

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Hexagram 49, 革 Gé, drawn as six lines numbered from the bottom: whole, broken, whole, whole, whole, broken. The lower, inner trigram is 離 Lí, Fire; the upper, outer trigram is 兌 Duì, Lake. 1 2 3 4 5 6 Upper, outer 兌 Duì, Lake Lower, inner 離 Lí, Fire 49 革 Gé Lines numbered from the bottom
The figure of 革 from the bottom line up: Fire inside, Lake outside. Two broken lines, four whole.

Facts

Number
49 of 64, in the received order
Character and pinyin
革 Gé ䷰
Our title
Changing the Hide
Lines, bottom to top
yang, yin, yang, yang, yang, yin
Lower trigram (inner)
☲ 離 Lí, Fire
Upper trigram (outer)
☱ 兌 Duì, Lake
Within (nuclear)
44 姤 Gòu, Encounter
King Wen pair
50 鼎 Dǐng, The Cauldron
Legge's name (1882)
Ko
Part of the text
The second part (下經), 31 to 64

Meaning

Water quenches fire and fire dries up water: put together, one of them has to give way. 革 is a hide, the skin of an animal, and the word for changing it, as animals moult; the tradition reads the hexagram as change of the deepest kind, the old exchanged for the new. The Judgment is cautious about it in a way the tradition admires: such a change is believed in only after it is done; then there is great progress, firmness pays, and regret disappears.

The Image ties change to the calendar: the superior man puts the reckoning of the seasons in order and makes the times clear. In our own reading, 革 is about change that is due rather than merely wished for, carried out after it has been tested and talked over, so that it is trusted. The line texts move from holding back to the great man changing "as the tiger" changes its stripes.

The lines

The first line is bound fast "with the skin of a yellow ox", in Legge's English, not yet ready to change; the second makes its change once its day has come. The third is warned against acting, and is believed once the change has been talked over three times; in the fourth, regret disappears and the change of orders is trusted. The fifth is the great man changing like a tiger, trusted before any divination; at the top the superior man changes like a leopard, and lesser people change their faces.

In the plum blossom story

The Plum Blossom book's first case lands on 革. Counting 5 for a 辰 year, 12 for the month, 17 for the day and 9 for the 申 hour, Shao Yong, it says, put 兌 above and 離 below, found the first line moving, and so came from 革 to 咸, hexagram 31. It is the book's legend about its own method, and the book is of the Ming period.

Its pair is 鼎, hexagram 50; within 革 lies 姤, hexagram 44, and every line flipped gives 蒙, hexagram 4.

In the birth cast

The time cast arrives at 革 when the year, month and day leave 2 on eight, which puts 兌 lake above, and the same total with the hour added leaves 3, which puts 離 fire 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 31 咸 Xián, Mutual Influence
  • Line 2 (六二) moving: becomes 43 夬 Guài, Breakthrough
  • Line 3 (九三) moving: becomes 17 隨 Suí, Following
  • Line 4 (九四) moving: becomes 63 既濟 Jì Jì, Already Across
  • Line 5 (九五) moving: becomes 55 豐 Fēng, Fullness
  • Line 6 (上六) moving: becomes 13 同人 Tóng Rén, Fellowship

Lines 2 to 5 give the hexagram within, 44 姤 Gòu, Encounter. 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)
離 bright, attached below; 兌 pleased, open above, in our English sourced
Trigram family places (Shuogua)
middle daughter below, youngest daughter above sourced
Trigram body and animal images (Shuogua)
eyes and pheasant below; mouth and sheep above sourced
Trigram phases (a classical correspondence: the Plum Blossom text's table)
Fire below, Metal above. 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: 50 鼎 Dǐng, The Cauldron; every line flipped: 4 蒙 Méng, The Untaught Mind sourced
Human Design gate
Gate 49, from 318.875° to 324.5° of the tropical zodiac on Ra Uru Hu's wheel (1987): a modern placing, not the I Ching's sourced
Our English title
Changing the Hide: EsoTerrier's own, from the sense of 革 our construction

How the schools read it

The Zhouyi, in Legge's translation (1882)
“(What takes place as indicated by) Ko is believed in only after it has been accomplished.”
The Image (大象), one of the Wings, in our paraphrase
Fire in the midst of a marsh; the superior man regulates the calendar and makes clear the seasons.
The Plum Blossom method (Ming)
A figure reached by numbers: 兌 above when the year, month and day leave 2 on eight, 離 below when the same total with the hour leaves 3.
Human Design (Ra Uru Hu, 1987)
Takes the number for its gate 49 and puts it on the zodiac; its own reading, which we do not quote.
EsoTerrier
Fire within the lake: a change whose day has come, trusted only when the time is right and others have been heard, and then showing in every marking, like a tiger's coat.

Claims about it

  • Gate 49 of Human Design, at 318.875° to 324.5° of the zodiac, is where the I Ching itself places hexagram 49.

    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 革 Gé 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.

  • Shao Yong invented the time method on the day his cast gave 49 革 becoming 31 咸.

    told as lore

    What the record shows: That cast is the Plum Blossom book's own opening story. The book was compiled in the Ming period under Shao Yong's name; no Song source tells the story.

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.

First published ; last revised . Corrections: support@esoterrier.com.