Binocular Cue: Retinal Disparity
Because our eyes are about 2.5 inches apart, our retinas receive slightly different images of the world. When the brain compares the two images, the difference between them (retinal disparity) provides an important cue to the relative distance of different objects.
If you close one eye and look at the same spot/image, the location of the object will shift slightly. That's because our brain merges both images received by the retinas, but take one away and the image shifts.
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