Final answer:
Relative height is a monocular depth cue that makes objects higher in our field of vision appear farther away due to their smaller size.
Step-by-step explanation:
Relative height is a monocular depth cue that involves our perception of objects higher in our field of vision as farther away. When an object is positioned higher in our visual field, it appears smaller due to the angle it subtends from our eyes. This size difference gives us the perception that the object is located at a greater distance.