Photography "shoe"
One of the experiments is the funniest photo with our "fotoscatola shoe." On one wall of a shoe box have a pinhole opening with a nail and inside of the opposite side of the tabs have glued cardboard to allow the insertion of a sheet of photographic paper sensitive. We put our shells on a pedestal in front of the fotoscatola. The principle is that if we set the same distance from the hole how much is the distance between the hole and the sensitive paper we obtain a negative large as the original. If we get a close approach to the hole and turn away if we reduce the image on paper, You insert the sensitive paper in the dark and close the box, with a finger closes the hole and placing the box in front of the shell at the right distance. With a slide projector with mirrors and lights well the shell. Then you can remove your finger from the hole for a time to experiment. We have obtained good results with exposures of about 5 '.