“The two words Yin and Yang are really one word; for when the Yang principle is exhausted, it becomes the Yin; and when the Yin is exhausted, it becomes Yang. And it isn’t that, at the exhaustion of the Yin, another Yang comes into existence; and that, at the exhaustion of the Yang, a second Yin arises.” – Cao Xueqin, The Dream of the Red Chamber (trans. H. Bencraft Joly)