The Zhou Yi began as a terse divination manual. The Ten Wings (十翼) are the ten commentaries that gave it wings - philosophy, cosmology, and ethics - and turned a fortune-teller's handbook into one of the Confucian classics. If the hexagrams are the skeleton, the Wings are the flesh.
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The Ten Wings are: Tuan Zhuan upper and lower (彖傳上/下), Xiang Zhuan upper and lower (象傳上/下), Xi Ci upper and lower (繫辭上/下), Wen Yan (文言), Shuo Gua (說卦), Xu Gua (序卦), and Za Gua (雜卦). Ten texts, traditionally counted as the "wings" that let the classic fly.
What each one does
The Tuan commentaries explain each hexagram's judgment; the Xiang commentaries explain its "image" (the Greater Xiang on the trigrams, the Lesser on the lines). The Xi Ci, or Great Treatise, is the philosophical heart - cosmology, the nature of change, the sage's role. Wen Yan expands only Qian and Kun. Shuo Gua decodes the eight trigrams' symbolism; Xu Gua explains why the hexagrams are ordered as they are; Za Gua contrasts them in pairs.
Who wrote them?
Tradition credits them to Confucius. Modern scholarship dates the Wings to the Warring States through Han periods - centuries after the Zhou Yi core - and sees multiple hands. Both views agree on one thing: the Wings are where the I Ching stops being only about divination and starts being about how the world works.
Why they matter
Where this leads
The Wings are also why we say Yi Jing for the whole classic and Zhou Yi for the core - see Zhou Yi vs Yi Jing. Classical passages from the Wings appear throughout our library; start with I Ching for Beginners if you are new.
For guidance and self-awareness purposes only. This lesson explains Chinese astrology as a cultural and philosophical framework - what it is, where it came from, and how its vocabulary works. It is not a prediction of your future, a medical or financial opinion, or a substitute for professional advice.