I have been taking photos with old box cameras recently. Below is a multiple exposure from a camera that is about 90 years old. The composition is totally done in the camera, in this case advancing the film a half frame at a time and composing the photo. You don’t know if it worked until you develop the film. I then digitize the film and work on things like contrast and toning. I have posted some examples of double exposures on my Artist site and blog. The photo here is of the Bethlehem Steel Furnaces in Bethlehem, PA.