system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How come when we close both of our eyes, our eyes can still perceive darkness, but when we only have 1 eye open, we can no longer "see" the darkness out of our closed eye?

Why are we able to "see" the lack of light behind our eyelids when both eyes are shut, but how come when only 1 eye is open, it feels like our closed eye just no longer exists?
gpt
What you "see" is not just the raw data coming in from your retinas. Your brain constructs your vision by adding a lot of neural processing to these images. Deleting the effect of a single closed eye is part of this processing.