I'm paralyzed and surprised with this long-term exhibition, with the photography achieved and with the solargraphic technique. It's the first time I've heard of these cameras. According to the link you offer, they are very easy to make, durable and very economical.
Honestly, this publication is very valuable for me in terms of art, photography and information. Best regards @archbitsmith
Thanks @marcybetancourt. They are indeed easy and economical to make, and I would encourage you to give it a try.
Surely I will try. The link you provide has all the instructions