At the end of former Han, due to thoughts based on Saii-setsu, etc., isho, which interpreted Keisho in a manner of mysticism appeared ('Kei' means 'the warp' in weaving and 'i' means 'the woof').
前漢末から災異思想などによって、神秘主義的に経書を解釈した緯書が現れた（「経」には機織りの「たていと」、「緯」は「よこいと」の意味がある）。