Dong Zhongshu
Liu An's (c. 139 BCE) "Huainanzi" "Masters of Huainan" is second only to the writings of Dong Zhongshu (see "Chunqiu fanlu" below) as a source for sympathetic-resonance theory in the Han period. According to Charles Le Blanc, the "Huainanzi" significantly advanced Chinese cosmological theory, largely due to the use of resonance as a catalyst that blended together ideas from the School of Yin-Yang (such as "ganying") with ideas from Daoism (such as "wuwei").