Another important monocular cue (depth cues available to either eye alone) is texture gradient. The closer an object is to us, the easier it is to see the texture/details of an object. When an object is further away, it is more indistinct and the texture is harder to see. Also, when objects are further away they seem more densely packed and smaller, which was shown with the previous monocular cue, relative size. Closer up, an object is more distinct and detailed. You can notice things up close that you could not see far away.
Texture gradient is easily shown in real life. Looking at a wall 30 feet away, it will look smooth and plain. However, by decreasing the distance between yourself and the wall, you start to notice the details on the wall such as the checkered texture or the extra paint splatter. When you are right in front of the wall, you can see things you could not notice even ten feet away! This increase is gradual as you get closer to the wall, not all of a sudden.
Another example of texture gradient is the picture below. Look at the picture and walk away from the picture. The further away you are, the harder it becomes to see the details. Close up, the picture looks almost 3-D, but by walking away it does not. The black is easier to see from far away, looking like a completely different image. If you walk far enough away, you can only see black and a little pink! This monocular cue allows us to see things in more detail the closer we are to the object, which is very helpful in every day life.
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