Editing Depth perception (section)

=== Curvilinear perspective ===
{{main|Curvilinear perspective}}
At the outer extremes of the [[visual field]], parallel lines become curved, as in a photo taken through a [[fisheye lens]]. This effect, although it is usually eliminated from both art and photos by the cropping or framing of a picture, greatly enhances the viewer's sense of being positioned within a real, three-dimensional space. (Classical perspective has no use for this so-called "distortion", although in fact the "distortions" strictly obey optical laws and provide perfectly valid visual information, just as classical perspective does for the part of the field of vision that falls within its frame.)