Legend has it that King Ji Chang composed this work in the Zhou dynasty. It consists of main text and its interpretations. The former gives 64 trigrams and 384 lines while the latter explain these trigrams and lines. Perhaps Confucius offered 10 chapters of such interpretations. Han scholars focused on auguring, but Song scholars emphasized the importance of principle. In the Northern Song dynasty, for instance, Cheng Yi based his numerical theory on principle. In the Southern Song dynasty, Zhu Xi reconciled both views. There should be 7 steles according to the character count and size, but only 2 remain visible now.