 The Dao is also taken to generate in stages, and actually in four of them (DDJ 40, 42; Perkins 2019; Robson 2015: 1483; Wang 2012: 48; etc.). There are various readings of the sequence, but one prominent view takes 0 as nonbeing, the Dao; 1 as unity, Being; 2 as duality,  yinyang;[45]  and 3 as multiplicity, namely heaven, earth and human beings. In a prescient recognition of how natural (heaven and earth) and social (human) constructions combine to make reality, 3 burgeons into 4, i.e., the 10,000 or myriad things that comprise the universe. Crucially, 4 returns to 0—to use the feminine imagery, returns to the womb where everything is possible and everything develops—and then the sequence repeats (Pregadio 2016 [2020: sec. 4], Wang 2012, 51 citing the Huainanzi). This world-to-Dao-and-back cycle is reminiscent of the occasion-to-God-and-back cycle in process theology, though on a grand vs. momentary  scale.[46]