What we see above is pattern. The human brain looks everywhere for patterns. All we can see above is patterns, and nothing is breaking the pattern they are repeating asymmetrically, they are random in colors but they aren't breaking the flow of the patterns. If something really odd visually is placed in here, it will break the pattern and will stand out from the rest of repeating shapes here.
Perspective and Dimension
Perspective is an approximate representation, generally on a flat surface (such as paper), of an image as it is seen by the eye. The two most characteristic features of perspective are that objects are smaller as their distance from the observer increases; and that they are subject to foreshortening, meaning that an object's dimensions along the line of sight are shorter than its dimensions across the line of sight. - source
There are several types of perspective Drawings, The most common ones are one, two and three point perspectives.
One Point Perspective
A drawing has one-point perspective when it contains only one vanishing point on the horizon line. This type of perspective is typically used for drawings of roads, railway tracks, hallways, or buildings viewed so that the front is directly facing the viewer.
Examples of One Point Perspective
These examples are from real world photographs for easy understanding, a simple wire-framed drawing made of up lines can also be used as an example here.
Two - Point Perspective
An image or drawing has two point perspective when it contains two vanishing points on the horizon line. These vanishing points can be placed along the horizon line arbitrarily. Two point perspective can be used to draw the same objects as one point, like two roads shrinking onto the distance. creating two different vanishing points.
This is a classic Example of Two Point Perspective.
This will give you a more clear understanding of two point perspective.
Three Point Perspective
Three-point perspective is often formed when we see images of buildings from above, or below. In addition to the two vanishing points from before, one for each wall, there is now one for how the vertical lines of the walls. For an object seen from above, this third vanishing point is below the ground. For an object seen from below, as when the viewer looks up at a tall building, the third vanishing point is high in space.
We just added another vanishing point to make it 3 point on already two points, which also shows how dimension are formed.
Four Point Perspective
Four-point perspective, also known as infinite-point perspective, is the curvilinear variant of two-point perspective. A four-point perspective image can represent a 360° panorama, and even beyond 360° to depict impossible scenes. This perspective can be used with either a horizontal or a vertical horizon line.