Making a pinhole camera can be pretty simple. But still, it can generate some astonishing images. Like the image above. It's made by Justin Quinell by means of a pin hole camera, and it documents the traces of the sun over the suspension bridge in Bristol over a six month period of time. That gives this image an exposure time of half a year! And the result is duely impressive: there's so much detail and subtlety in the image, and that without a complex and expensive camera!
This image has been called the photo with the longest exposure time in the history of photography. But that claim is simply false. The actual longest exposure times have been captured by Michael Wesely. In 2001, he documented the redevelopment of the Museum of Modern Art in New York in single images, making photographs with an exposure time of up to 34 months. Surreal.
I found this through http://itchyi.squarespace.com/.