Pinhole camera diagram
Image credit: By en:User:DrBob (original); en:User:Pbroks13 (redraw) [Public domain], via Wikimedia Commons

I’ve been interested in pinhole cameras ever since I learned how to make one of out a coffee can in elementary school. A simple idea: take an enclosed container, make a small hole in one end of it, and place photo-sensitive material (film or paper) at the other end. Light comes in the pinhole and creates an image on the film or paper. It’s a simple idea, but it can produce beautiful images. Worldwide Pinhole Photography Day was created to celebrate the art of pinhole photography, encouraging people around the world to make their own cameras and take pictures with them on April 29th. The resulting images can be submitted to the official website for inclusion in an online gallery.