I once saw a simple explanation. Look at a picture of a giraffe. Now look at another picture of a giraffe. Are they the same? It’s hard to tell, right? You are blind to the giraffe pattern. You can see it, but it doesn’t mean anything to you. You have to put a lot of effort to be able to identify a giraffe and will have a hard time recognizing it if you see it. You will have an easier time picking out some other aspect to identify it rather than the pattern, and they all look the same.
Pretty much the same thing, but with people and their faces.
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