Liu Dongwei was skilled at painting dragons, and one day a husband and wife came to his gate and said: “Dragons are male and female, and their forms differ. The males have horns that are wavelike and concave, their eyes deep and noses slit, their fins pointed and scales thick, strong above and weaker below, and their tails glow with bright flame. The females’ horns are extravagant, wavelike and even, their eyes shallow and their noses straight; their fins rounded and their scales thin, their tails are strong and thick.” Wei said: “How do you know this?” The people said: “We are ourselves dragons.” They transformed into a pair of dragons and flew away.
Anon., Huhai xinwen yijian xuzhi, 後2.265 (Tale 480):
Yuan Haowen 元好問, Chang Zhenguo 常振國 (ed), Xu Yijian zhi 續夷堅志 (Continued Records of the Listener), and Anon., Jin Xin 金心 (ed.), Huhai xinwen yijian xuzhi 湖海新聞夷堅續志 (Continuation of Records of the Listener with New Items from the Lakes and Seas) (Beijing: Zhonghua shuju, 1986).