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
Yin and yang sun ④ in relief ⑤ open; overt ⑥ belonging to this world ⑦ [linguistics] masculine ⑧ south side of a hill ⑨ north bank of a river The compound "yin-yang" 陰陽 or 阴阳 means "yin and yang; opposites; ancient Chinese astronomy; occult arts; astrologer; geomancer; etc.". The sinologist Rolf Stein etymologically translates Chinese "yin" 陰 "shady side (of a mountain)" and "yang" 陽 "sunny side (of a mountain)" with the uncommon English geographic terms "ubac" "shady side of a mountain" and "adret" "sunny side of a mountain" (which are of French origin)... Many Chinese place names or toponyms contain the