CAMERA OBSCURA
Go into a very dark room on a bright day. Make a small hole in a window cover and look at the opposite wall. What do you see? Magic! There in full color and movement will be the world outside the widow — upside down! This magic is explained by a simple law of the physical world.
What is a camera obscura?
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Camera Obscura Gallery
http://www.room29.net/CameraObscuraFlash.htm
Camera Obscura

Camera Obscura, Camera Lucida
Adventures In Cyber Sound
A history of photography

Vermeer's Camera