Texture Gradient
When looking at an object that extends into the distance, the texture becomes less and less apparent as it goes further into the distance and this change in clarity allows use to percieve distance
https://www.flickr.com/photos/29590525@N02/galleries/72157632026471475
In the example above, the texture of the rock is more clear towards the front and less clear towards the back. In fact, the texture of the rock is almost indecernible in the back, and this tells us that the part with the blurry texture is farther away in the distance.
Also, when an observer is 20 feet away from a wall, he will not able to see the detail in the texture. As he gets closer and stands right before the wall, he will be able to see things that he could not when he was 20 feet away. This correlation between distance and texture is interpreted as a monocular cue.
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