Chinese sun and moon mirrors being hung round the neck, or because necks are concave things. Liu An's (c. 139 BCE) "Huainanzi" "Masters of Huainan", which is a compendium of writings from various schools of Chinese philosophy, was the first text to record "fangzhu" dew-collectors. Two "Huainanzi" chapters metaphorically use "sun and moon mirrors" to exemplify "yang" and "yin" categories and elucidate the Chinese notion of "ganying" "cosmic resonance" through which categorically identical things mutually resonate and influence each other. The "yángsuì" 陽燧 "burning-mirror" is "yang", round, and sun-like; the "fāngzhū" 方諸 "square receptacle" is "yin", square, and moon-like. The first context describes "yangsui" and
Zhou Dunyi natural world. Many Confucians believed that he embodied the virtue of "authenticity". He had great insight into the Way of Heaven. The first major popularization of the taijitu symbol is also credited to Zhou Dunyi; this symbol (in an altered form) is now known worldwide as the commonly accepted symbol for the Chinese concepts of yin and yang. Zhou Dunyi Zhou Dunyi (; 1017–1073) was a Song dynasty Chinese Neo-Confucian philosopher and cosmologist born during the Song Dynasty. He conceptualized the Neo-Confucian cosmology of the day, explaining the relationship between human conduct and universal forces. In this way, he emphasizes