pinhole camera - photography

The pinhole camera is a camera that captures images through a tiny pin sized hole.
It basically requires a dark box, or a can with a piece of photographic paper inside - like the Rayograph, the image is essentially.. imprinted(?) onto the paper, only, with the pinhole camera the light comes through the teeny hole and records images with the light of the sun.
Here is a photo example;

The only experience i have had with a pinhole camera was when we got to make our own - a Solar Can- in class.. The best results occur after leaving it out for a few weeks/months. once retrieving the paper, it should have the recordings of the sunrises and sunsets with some small details of trees, buildings etc... Unfortunately i dont have an image for mine as lots of water leaked into it and destroyed any image that was there :( I've been meaning to make a new one but just havent got round to it.
The Solar Can is the same idea, just in a can... The circular-ness of the can i think makes this cool recording on the sun rising and basically tracks time.
example:



I think these are really cool cameras and i'll definitely be making another one in a couple of weeks when i find time :)