On my first year with photography classes, I was given a task. I had to design a camera obscura as product for certain audience. While wondering who would like to have such camera, I came to conclusion that it could be great educational toy.
This project is usig mirror to reflect image on focusing screen made of transclucent paper and becauce of that kids recive live view that is not reflected upside down like in simple camera obscura. Focusing screen can be replaced with photographic paper. Full process is described on camera itself to let kids learn how this camera works.
Camera is made of cardboard and it's using reflecting paper in place of glass. Thanks to that camera is eco-friendly and safe for children.