Most people in the world are shallow-minded, only seeing skins and not seeing what bones are.

Bone image is the shape of skull, through which we can judge people's personality, adaptability, attitude towards religion and whether they are prone to crime. Osteography is very popular, especially from 1840 to 1850, reaching its peak. The photo album Notes on Moon Cave says: "The so-called nine bones are cheekbone, post horse bone, general bone, sun horn bone, moon horn bone, dragon palace bone, seven rhinoceros bone, eight ministers bone and Kowloon horn bone. Everything is bright 10% brilliant, 20% generous, 30% steady, 40% bright, 50% peaceful, 60% loose, 70% sincere, 80% intelligent and 90% virtuous.