La vida brinca--life jumps--and yet we strive to capture its passing moments by creating images. One of the simplest yet most evocative techniques for image-making is pinhole photography. Using a tiny aperture without a lens to shine light on a piece of film, pinhole cameras accumulate light until an image forms. Bill Wittliff calls the cameras he makes tragaluces, "light swallowers." By controlling only the size of the aperture,...