Linear Perspective (Monocular Cue)

Linear Perspective is an example of a monocular cue, a depth cue that is able to seen with one eye only, that explains the phenomena of two parallel lines that appear to converge as they continue towards the horizon. The closer the two parallel lines appear correlates to a greater perceived distance between the viewer and that point on the horizon. For example, in the photo below, the path with parallel sides becomes closer together as the distance between the photographer and that point on the path increases.