 In the studies of Neo-Daoism of the Wei-Jin period (220–589), scholars usually consider you (Being) and wu (Non-being) as a dichotomy, either as a contrast between the totality of the universe (Dao) and the myriad things, or as a differentiation between the principle governing the generation and regeneration of the universe (li) and the manifestations of that principle in the activities of animate beings (Chan 1963 [1969: 314–324]; Graham 1959; Schipper 1982 [1993: 192–208]). This dichotomy may be accurate in discussing Neo-Daoism in general and Wang Bi’s commentary to the Laozi in particular. But in Wang Bi’s Yijing commentary, he sees you (Being) and wu (Non-being) as co-dependent (Tang 2015: 51–59; Wagner 2003: 83–147; Yu 2007: 116–148, 204–240). He argues that the one unused stalk symbolizes wu (Non-being), and the forty-nine used stalks stand for you (Being). On the one hand, you depends on wu because the forty-nine yarrow stalks become useful only when they are utilized in casting a hexagram. On the other hand, wu cannot fulfill itself without you because there is no way to perform a divination without the 49 yarrow stalks. As wu, the practice of divination gives unity and coherence to the act of throwing of the 49 yarrow stalks. As you, the act of throwing the 49 yarrow stalks makes divination possible.