artists make shapes in the background smaller then shapes in the foreground to communicate their distance from their viewer. How else might a landscape artist show shapes in the background to depict thier distance from the viewer

The landscape artist might use a technique called atmospheric perspective. This involves using color, value, and detail to create the illusion of distance. In general, shapes in the background will be less saturated in color and lighter in value than shapes in the foreground. They may also have less detail, as the viewer's eye cannot see small details at a distance. The artist might also use overlapping shapes or a decrease in contrast as objects recede into the distance. All of these techniques work together to create the illusion of depth and distance in a landscape painting.