This is called adaptation. The nerve cells respond best to changes, it’s the same kind of thing when you put a napkin or something light on your hand, you will feel it at first but then you get used to it.
Why do we have this evolved? Things that are moving and changing would probably kill us quicker than something that doesn’t. It makes sense that we are tuned to notice changes around us
Your eyes have low resolution. You actually “see” with your brain, as it stitches all the information it gathers into a single coherent image. It also uses your memory to augment what you can’t actually make out. This is why optical illusions work, and why you sometimes think you see something that isn’t there.
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