Ko I wrote the "Clarification of Figures used in Eki-kyo" and proved that the figures of art of divination such as 'the figure of Taiji,' 'Senten-zu' (the innate figure), and 'Katoraku-sho' (pictures of legend good omens, which were thought to be related to Eki-kyo), which were valued in Neo-Confucianism, were originally not related to Ju-kyo.
胡渭は『易図明弁』を著し朱子学が重視した「太極図」や「先天図」「河図洛書」といった易学上の図が本来、儒教とは関連性がなかったことを証明した。