holiday in the hometown

in #nature7 years ago

 In the book The History of Photography by Alma Davenport, in the product of the University of New Mexico Press in 1991. In the 5th century BC, a man named Mo Ti had observed a cause. If on the walls of a dark room there is a small hole in front of it, then the interior of the space will be reflected from the outer space in reverse through the hole.