Okay. I am having a postmodern moment here. First I'm hooked by the cardboard cameras that really work idea. Simple film camera - tricky but I can see that. Alright it's a pinhole camera, it's still cool. You can insert a plate or film and capture the image. In fact, it's classic - goes back centuries.
But only some of them work, if you call being a pinhole camera 'working', given that they are replicas of a different kind of mechanism of camera.
So, what is it about these remediated objects that is anything other than just gorgeous? It's tech porn with lashings of nostalgic enviro friendly feel good.