Editing Depth perception (section)

=== Elevation ===
When an object is visible relative to the horizon, humans tend to perceive objects which are closer to the horizon as being farther away from them, and objects which are farther from the horizon as being closer to them.<ref>{{cite book |first1=Neil R. |last1=Carlson |first2=Harold L. |last2=Miller Jr. |first3=Donald S. |last3=Heth |first4=John W. |last4=Donahoe |first5=G. Neil |last5=Martin |year=2010 |title=Psychology: The Science of Behavior |page=187 |edition=7th |isbn=978-0-205-76223-1 |publisher=Pearson}}</ref> In addition, if an object moves from a position close to the horizon to a position higher or lower than the horizon, it will appear to move closer to the viewer.