All, that a whole note i think
It needs a aperture, compound lens, a photosensitive plate or paper, and a included box for the photosensitive paper to not get exposed by other light sources or a box that is black covered inside and out to not reflect any other light other than what comes thru the aperture or the shutter to precisely capture a amount of light to expose the film properly and not over or under expose it.
In not 100% sure but is it true?
A book cafe is a relaxing place where you go to read books and eat/drink things you would get at a regular cafe. People also read books there.
Eakins used photographs as a teaching tool with students