👉 Celidography is a technique used to read and write on paper using light, with an object in one hand and a book or other writing surface in the other. The process involves placing a small prism or lens on top of a sheet of paper, which allows light to pass through it and onto the page. When the light reaches the surface of the paper, it is reflected back into the prism or lens, which can be used to create an image on the page. The result is that a
