Take a step back in time! You might want to help your grandchildren build this so that you can explain “this is how we used to do it in the good old days!” Then again, maybe not. They may think you are older than you really are. Well, it will also teach them about physics.
A pinhole camera is a simple camera that uses a single small aperture – a pinhole – instead of a lens. As light passes through this hole, an image is exposed onto the film loaded inside the camera. Exposure times are typically longer than with a normal lensed camera, due to the aperture being so much smaller. This means that pinhole cameras can typically take anywhere from a few seconds to a couple of hours to expose a photograph. Because of these long exposures the shutter is usually manually operated. Pinhole cameras were very popular back when photography first became popular for in-home use.