《抱朴子·内篇·论仙》
如果仙人都像郊间人那样两目瞳孔正方，像邛蔬那样两只耳朵长出头项，或者像马师皇那样骑蛟龙而行，像王子乔那样驾白鹤升天，或者像伏羲那样身生鳞、女娲那样长蛇身，或者乘金车、身着羽服，那么凡人就可以知道他们是仙人了。
若使皆如郊閒两曈之正方，邛疏之双耳，出乎头巅。马皇乘龙而行，子晋躬御白鹤。或鳞身蛇躯，或金车羽服，乃可得知耳。
If immortals all had square pupils like the people of the countryside, ears that reached above their heads like the people of the Qiong Mountains, or if they rode on dragons like the horse-trainer Huang, ascended to heaven on white cranes like Prince Qiao, were born with scales like Fu Xi, or snake bodies like Nüwa; or rode in gold chariots and wore plumed garments—then ordinary people could recognize them as immortals.