The learning of geometry is to allow anyone to have an idea of correct perspective to objects.
Dimensions are important in this area. Angle of view is equally important.
Drawings of object in the fore-ground and background differs because of geometry.
When the concept of geometry is violated in drawing objects, you will get interesting outcome.
This outcome, however, is apparent only in the virtual sense and cannot be physically produced.
Example of links are quoted below:
Geometrically deceptive objects are not easily identified, and have to be closely stared at to reveal their "wonders".
Only through learning maths and its relevant topics, you can then appreciate the importance of having done it. This is very obvious in the above few examples.