Yarrow / Source Notes / 2026-07-17
Yarrow 综卦 source note · 2026-07-17
Compare Hexagram 41 Sun (Decrease) and Hexagram 42 Yi (Increase) as a zong gua inverse pair: reversed line order changes viewing direction without forecasting a transition.
Decrease: with sincerity, supreme good fortune. No blame. One may be persevering. It is favorable to undertake something. How is this to be carried out? Two small bowls may be used for the sacrifice. The Image says: Decrease means diminishing below and augmenting above; its way moves upward.
The hexagram image of "a lake beneath the mountain" symbolizes the meaning of "diminishing what is below to benefit what is above.
Increase. It furthers one to undertake something. It furthers one to cross the great water. The Image says: Increase. The upper is diminished, the lower is increased; the joy of the people is without bound. What is above descends to what is below; thus the Way is greatly illumined.
Thunder and wind share the attribute of "responding to one another in resonance." The two reinforce each other: when thunder stirs, wind arises; as the thunderclap shakes the air, the wind follows.
The local structured corpus records Hexagram 41's 综卦 (zong gua, inverse) as Hexagram 42, and Hexagram 42's inverse as Hexagram 41. In the corpus's stored six-line sequence, 001110 becomes 011100 when the order is reversed. Turning the figure end for end changes line positions while preserving each line's yin or yang polarity.
Draw 001110 and 011100 in two columns, reverse the first sequence, and verify the match. Then copy one concrete phrase from the reference layer for Sun and one from Yi; name one observable condition supporting each lens, choose one reversible check, and write what evidence would make you review the choice.
A zong gua pair is not a before-and-after promise. Sun does not automatically become Yi; reversed structure neither ranks the two figures nor says which one must follow.
The reference layers and the zong-gua relationship come from Yarrow's bundled structured Zhouyi corpus. The English wording is an editorial explanation of that stored relation. This note is not a fresh cast, a forecast, or a claim that one hexagram must turn into the other.