The I Ching, or Book of Changes, is among the oldest books in continuous use anywhere in the world. This module presents the sixty-four hexagrams: the figure itself, king Wăn's judgment, the Great Symbolism, and the six line statements attributed to the duke of Kâu.
Every judgment and line statement here is Legge's own wording, not a paraphrase. The digitised text was checked passage by passage against a scan of the original volume; across the judgments and line statements the two agree almost verbatim, and the Great Symbolism was confirmed separately against Appendix II, where Legge places it. Where the digitisation is incomplete — hexagrams 1 and 2 each carry a seventh, supernumerary paragraph in Legge that ctext does not reproduce — the omission is stated on the hexagram itself rather than quietly filled from elsewhere.
The hexagram figures are not images. Each is drawn from the same six-line code that defines the entry, so a figure cannot drift from the hexagram it belongs to. Those codes were checked against Legge's own plates and against the mathematics of the King Wen sequence, in which each even-numbered hexagram is the inversion of the one before it, or its complement where the figure is symmetrical.
Names are given in two forms. The primary name is the pinyin romanisation used by the digitised text; Legge's own 1882 spelling is listed alongside it, together with the Chinese characters and the common English titles. All four forms are searchable. The King Wen number is the only unique key — romanisations collide, in both systems.
The casting tool uses the three-coin method: three coins per line, six lines built from the bottom upward, with sixes and nines marked as moving lines that change into their opposite to yield a second hexagram. The transformation is arithmetic, not interpretation. The yarrow-stalk method, which weights the moving lines differently, is not implemented here.
— Evander Blackwood