The Coast of Portrieux by Eugene Boudin

This cue can lead to a powerful sense of depth as seen in this landscape by Eugene Boudin called "The Coast of Protrieux". The coast near you is at the bottom of the page and as it recedes in distance it gets ever higher. As there are not any objects, nor any interposition, nor any real strong texture, the primary cues to depth being used in this picture is relative height.