The question
How did a book of broken and unbroken lines become one of the world’s great classics?
The short answer
The I Ching began as a Zhou dynasty divination manual built from 64 six-line figures. Commentaries added over centuries turned it into a book of philosophy that has been read for about 3,000 years.
What science knows
Historical FactThe core text dates to the Western Zhou period, around the 9th century BCE. It pairs each of 64 hexagrams with a short, often cryptic judgement.
The “Ten Wings” commentaries, added during the Warring States and Han periods, gave it a philosophical layer. Tradition credits them to Confucius; modern scholars see several later authors.
The pattern
Established MathematicsEach line is broken (yin) or unbroken (yang), so three lines give 2³ = 8 trigrams and six lines give 2⁶ = 64 hexagrams. In 1703 Gottfried Leibniz, who had developed binary arithmetic, noticed that one traditional ordering of the hexagrams matched counting in binary.
What is still uncertain
Mixed EvidenceHow the hexagrams were originally used and who composed the earliest layers is debated. Excavated texts, such as the Mawangdui silk manuscript (2nd century BCE), show different orderings from the received version.
Why humans find it interesting
Cultural TraditionPeople consulted the I Ching by sorting yarrow stalks or tossing coins to build a hexagram. The psychologist Carl Jung wrote a famous foreword to Richard Wilhelm’s translation.
CUE perspective
CUE PerspectiveThe I Ching is a system of symbols built from simple binary rules and read for guidance, a close ancestor in spirit to what CUE does with numbers.
CUE’s framework is its own, but it shares the I Ching’s idea that a structured symbol can prompt reflection on a situation.