Sensation and Perception  -> Lecture 2  -> Page 4       

 

As a depth cue texture gradient relies on the fact that many scenes involve similar textural elements: grass, pebbles, tiles, or the hay bales in the picture at left.  As these textural elements get farther from us, they appear smaller and closer together.  That provides us with a clue to their relative distance.

 

We can also see the depth cue of  linear perspective in this same picture: As parallel lines become more distant from us, they appear to get closer together - like the sides of the gray bit at left.  Their apparent closeness is therefore a cue to their relative distance from us.