That is like asking... "Why to artists paint things they color they actually are." They use perspective drawing to make the work more realistic. A drawing is done on a flat 2D (2 dimensional) surface, so the use of perspective is a visual "trick" to introduce the third dimension. When the drawing is done correctly, you don't really notice it. It just looks right. When it is done incorrectly, it sticks out.. and looks bad. Without perspective drawing, the image would look flat and out of plac
