《论衡·卷三·奇怪篇》
孔子吹律管，自己知道是殷的后代；项羽每只眼睛有两个重叠的瞳仁，所以自己知道是虞舜的后裔。
孔子吹律，自知殷後；项羽重瞳，自知虞舜苗裔也。
Confucius played the reed pipe and knew that he was a descendant of the Yin Dynasty; Xiang Yu had two overlapping pupils in each eye, so he knew that he was a descendant of Emperor Shun.