You should read more about how the brain works on a visual level, then you'll learn that it fills in the blanks and sometimes makes you see things that are not actually there, but it seems real to you because that's how your brain processes it. It happens most in the dark because that's when your eyes rely on your cones to process the visual images, and since they are not as powerful as rods, your brain struggles to make understandable images out of stuff that you are having difficulty seeing.
I can see ghosts
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You should read more about how the brain works on a visual level, then you'll learn that it fills in the blanks and sometimes makes you see things that are not actually there, but it seems real to you because that's how your brain processes it. It happens most in the dark because that's when your eyes rely on your cones to process the visual images, and since they are not as powerful as rods, your brain struggles to make understandable images out of stuff that you are having difficulty seeing.