How to use 3 hours of free time? Self making a camera of course! How? A card board, scissors, gray-tape, a goal, and go. The principle is rudimentary: For the lens, look for those old school of USSR (they are cheap and good in quality) and remove of them its first converging lens. The goal is not quite perpendicular to the film, and image capture is on photographic paper; suddenly, shots are getting a blur characteristic and the captured light is not normally visible to Humans (200nm -> 400nm)
THE CARTON