system
Given the following post, respond as if you're commenting on Reddit:
human
Why does covering the eyes of a person impede our ability to identify them so much?

Like when they put a black bar over a person's eyes in a photo to conceal their identity. Most of the face is left untouched and yet it is hard for the human brain to identify the person. Why?
gpt
There are a *lot* of variable features about eyes. They can be different colors, wildly different shapes of the overall socket, the eyebrows are distinct, single-lid/double-lid, how deep the indentation is, the relation of the forehead to the eye opening, the shape of the actual opening of the lids, the expressions the person typically makes using their eyes... there's just a lot more variation in the eyes and surrounding area than other areas of the face.