This is a painting I found in the staircase of the Brooklyn College Student Center. It perfectly represents the use of the system of linear perspective to create the illusion of a three-dimensional space on a two-dimensional surface. Below is a copy of the above image with the orthogonals traced in green and then the main lines extended to demonstrate the vanishing point.
The orthogonals are the lines that would be parallel were you actually to stand in that scene and measure them. Instead, when seen from a certain angle, they seem to converge on a single point. As you can see, this technique is very effective at tricking the eye and mind into thinking there is depth to the image.
The painting was set on the wall against the staircase so that as you descend the stairs, the vanishing point becomes eye level for you. This is how linear perspective works best, like we discussed regarding how Massacio’s painting of the Trinity was set at eye level for maximum effort.
-Chaya Ovits, team Venus