Eric Renner has written:

'Pinhole Photography'

'Bibliography of pinhole optics in science and art from the 5th century B.C. to 1850 A.D' -- subject(s): Bibliography, Geometrical optics, Photography, Pinhole, Pinhole Photography

Abelardo Morell has written:

'A camera in a room' -- subject(s): Artistic Photography, Photography, Artistic

'Camera obscura' -- subject(s): Camera obscuras, Photography, Pinhole, Pinhole Photography

The mollusk Nautilus

Not only are pinhole cameras entirely legal to use, they can be fun to build and use.

Making and using a pinhole camera uses all of the really important principles of photography. Any serious student of photography should do just that. Apart from the satisfaction of having a picture that you can say you created all by yourself, it will teach the principles in only two or three hours.

Yeah, easiest is to build a pinhole camera. http://www.pinhole.com/ Or read: "Pinhole Photography" by Eric Renner