 The correlative model of the Taixuanjing, as it follows in general the kind of “Five Phases” thought found in earlier works, is presented in the style of the Yijing, as short descriptions of divinatory tetragrams. It is a notoriously difficult text, written in the same terse, poetic, and suggestive way as the Yijing itself, and its main focus is divinatory, although Yang develops some philosophical positions in the text as well.