Artists know how to deliver realistic images by applying two laws of perspective. First, there is linear perspective where things appear to get smaller as they become more distant (as in straight roads converging toward the center of the view). Next, there is aerial perspective where things appear to be hazier in the distance as there is more atmosphere (not exactly transparent) between the viewer and the object gets thicker (as in purple mountains).
This image taken by Verna illustrates both perspectives – she took this picture from the road between Cottonwood and Jerome, AZ. The image is a segment of the larger image – you may click on this to see the full image.