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Original study guide · 27

Hexagram 27 · Yí (山雷颐)

Direct summary

Hexagram 27, Yí (山雷颐), places Zhèn (震, Thunder) below Gèn (艮, Mountain).

Its nuclear and opposite forms are Hexagrams 2 and 28; reversing its line order leaves Hexagram 27 unchanged.

Structure reading

The lower trigram is Zhèn (震, Thunder); the upper trigram is Gèn (艮, Mountain).

Sequence context

In the received sequence, Hexagram 27 comes between Hexagrams 26 and 28.

Study prompt

Compare Hexagram 27 with its nuclear form (2) and opposite form (28). Then inspect why reversing the six-line order leaves it unchanged. Where is the symmetry?

Editorial references

  1. Yi structural index: King Wen number, name, trigrams, and nuclear, opposite, and reversed forms.
  2. Yi editorial method: site-authored guidance is kept separate from classical text.
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Yi original study guidance based on verified structural facts. No restricted source passage is reproduced.