The normal picture on paper is only on-eyed. It is photographed with only one lens and can, therefore, not convey a true spatial perception, but it is only a flat picture. A lenticular is a thin, full color stereo picture. Thin plastic "lenses" placed over the photograph restrict the view of each eye to a particular part of the picture. 3D photography duplicates the way we view a 3D object or scene by taking a pair of photographs separated by a distance equal to the separation between a typical person's eyes. The two pictures then have a viewpoint similar to the view seen by the left and right eye. These images, if directed to the eyes, are fused by the brain into a single image with the appearance of depth, creating such a space image (pseudo 3D).