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Original study guide · 21

Hexagram 21 · Shì Hé (火雷噬嗑)

Direct summary

Hexagram 21, Shì Hé (火雷噬嗑), places Zhèn (震, Thunder) below Lí (离, Fire).

Its nuclear, opposite, and reversed forms are Hexagrams 39, 48, and 22.

Structure reading

The lower trigram is Zhèn (震, Thunder); the upper trigram is Lí (离, Fire).

Sequence context

In the received sequence, Hexagram 21 comes between Hexagrams 20 and 22.

Study prompt

Compare Hexagram 21 with its nuclear form (39), opposite form (48), and reversed form (22). Which comparison is easiest to describe from the structure alone?

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.