 The doctrine of self-transformation, for which Guo is particularly remembered, affirms that the Dao is everywhere and in all things. The logic of immanence takes full effect, once nothingness is removed from view. Even in the most base and lowly, as the Zhuangzi emphasizes, the presence of Dao can be detected (Chapter 22). To Guo Xiang, the Zhuangzi can only be alluding to the pervasiveness of qi.