Understanding the background, middle-ground & foreground relationship
is key to understanding how to create the illusion of *

As described, it may be depth, in terms of creating the illusion (on 2 dimensional media) as appearing 3 Dimensional; taking and refining perspective, using light and shadow and so forth to best create the 3rd Dimension on 2D media.

Explanation:

answer; i believe the correct answer is in new york,in subway stations,public murals and night clubs;