《论衡·卷二·无形篇》
画仙人的形象，身体长毛，两臂变成翅膀，在云中行走，于是寿命增添，千岁不死。
图仙人之形，体生毛，臂变为翼，行於云则年增矣，千岁不死。
Drawing the image of an immortal, with a body covered in long hair, with two arms formed into wings, walking in the clouds; then the lifespan will increase and the immortal will not die until he is a thousand years old.