A pinhole camera is a camera with a pinhole aperture effectively a light-proof box with a small hole in one side. Light from a scene passes through the aperture and projects an inverted image on the opposite side of the box, which is known as the camera obscura effect.
Here are some examples of pinhole cameras
My pinhole photos
WWW:
This is probably one of my best pinhole pictures I took, it took loads of persistence and discipline to achieve this good picture.
EBI:
Next time I wouldn't move the camera as much so I could prevent it from being blurry.