Antique photography fun
Dating from 1848, cyanotype imaging is the oldest chemical image-making system known.
Following a couple of chance events (a sale at an educational supplies store near us, and some YouTube randomness from BoingBoing), I decided to build a cyanotype camera.
Some years ago a friend of mine gave me a lens from a TV projector, so that was a starting point.
Add to that a black cardboard camera box, a handful of bolts and some gaffa, and in about 30 minutes I had a camera obscura working.