To make the interior light-proof and prevent reflections. A pin or needle: To create the tiny aperture (the "lens"). Tape and scissors. Step-by-Step Construction
One must be slightly smaller than the other so it can slide snugly inside (e.g., a large and small soap box, or two A3 sheets rolled into tubes). How To Make A Pinhole Camera Using Butter Paper
This serves as your translucent viewing screen. To make the interior light-proof and prevent reflections