In brief , perspective is a matter of camera location. As Randy states it is a subject covered in a freshman course and the link to an exercise related to this subject might clarify this in practical terms. I believe but may be wrong that sadly this project is no longer included in the course as it was deemed too hard for freshmen to deal with and solve. http://www.davidhazy.org/andpph/text-perspective-exercize.html Andy > On Feb 18, 2016, at 2:33 AM, Kostas Papakotas <clenchedteethphotography@xxxxxxxx> wrote: > > huh? > https://www.youtube.com/watch?v=RjtCI_hSzio > >