Solargraphs are a very long exposure variant of a Pinhole Camera. The cameras themselves are made in the same way and therefore pairs well with a regular pinhole camera workshop.
The nature of the photographic paper is that when exposed for sufficient time the paper itself will discolour, allowing for direct exposures over several weeks / months. The paper will capture a faint image of the landscape outside but most excitingly captures the path of the sun across the sky each day.
An advantage of this process is it does not need darkroom chemicals as the paper is not developed in the usual way, the image is scanned or photographed straight out of the can.
