In a universe animated by the interaction of yin (female) and yang (male) energies, the moon was literally yin visible. Indeed, it was the very germ or source of yin, and the sun was its yang counterpart.
Li BaiThe birds have vanished into the sky, and now the last cloud drains away. We sit together, the mountain and me, until only the mountain remains.
Li BaiBeneath the blossoms with a pot of wine, No friends at hand, so I poured alone; I raised my cup to invite the moon, Turned to my shadow, and we became three.
Li BaiTo wash and rinse our souls of their age-old sorrows,We drained a hundred jugs of wine.A splendid night it was . . . .In the clear moonlight we were loath to go to bed,But at last drunkenness overtook us;And we laid ourselves down on the empty mountain,The earth for pillow, and the great heaven for coverlet
Li Bai