A pinhole camera is simply a lightproof box, with a very tiny hole (hence the term pinhole camera) on the side. I used a beer can as my lightproof box smothered in gaffer tape. Light from the pictured area passes through the pinhole and casts an inverted image on the opposite side.
Now that the concept is understood I wanted to take it slightly further, with the idea that the image projected is much sharper then any digital camera. Using lots of beer cans all lined up together, exposing each beer can after another. So having a row of images and inverting them in Photoshop. Then put into Adobe flash, I'll be able to create a short stop frame animation. Now to find the right area, and to save up for the pinhole camera kit from Hawkins Bazaar.
(image from wikipedia.com)