Question

What was the method of creating a three dimensional illusion on a two dimensional surface known as

Answer 1

It is when you draw an isometric perspective on a 2D surface

Answer 2

Whenever we look at a flat surface (a picture, a television screen) and assume we are looking at spaces and objects that have depth, we are accepting a set of visual signals that create an illusion of three dimensional space. 3D cues are so common today that we are almost unaware of them.