Who created the first mathmatical system of perspective in painting

To make an etching the artist first coats the entire printing plate with an acid-resistant substance called a made from beeswax, asphalt, and other material. the artist then draws on the coated plate with an etching needle exposing the metal. next the plate is dipped in the plate is removed, the waxy coating removed, and the plate is cleaned, inked and printed.

Where is the photoshop flaw in this picture? a. the fish is too large, b. the head has been pasted on another persons body, c. the guy has no hands, d. the background has been altered.

When you shoot using the lowest number possible for your aperture what is it called