A zograscope makes a realistic experience for someone looking through it is by enhancing depth perception. One way is by minimizing other depth cues that specify the flatness and pictorial nature of the picture. The image is magnified, perhaps giving it a visual angle similar to the real scene the picture is depicting. The edges of the picture are blocked by the frame of the lens. The light coming from the lens to the eye is collimated, preventing accommodation. In early prints of interior scenes, some objects were hand-tinted with saturated colors whereas the background was tinted with "a pale wash" exploiting color contrast as a depth cue.