A cool site with everything you wanted to know about building and using Oatmeal box pinhole cameras.
Sweet link. I've got a picture I took back in the day in Applied Science in grade 8 or 9 from a pinhole camera. Its a picture of my old dog and is probably one of the best pictures I've ever taken, period. Great focus, great depth of field.....may have to try again, or maybe better to leave the memory of perfection alone and not......
I built one of those back in the 6th grade for the science fair. Won a trophy for it.