Riddle: What's the answer to the riddle about photos?

Tip: The photo is an image from photography, starting from 1826. Photons are usually collected by photosensitive paper, and the principle of light phase formation is to produce still images on radiation-sensitive materials such as photosensitive film, paper, glass or metal through the chemical action of light.

Mystery: I have white hair. He is still a doll. He is supposed to be me, but I am also him. Answer: photo riddle: not as big as me. I can put it on the table or hang it on the wall without talking. (Hit an ordinary object) Answer: Photo.