When it's twighlight, your vision goes sort of grainy. I used to believe that this was because I could see air molecules.
A childhood belief about eyes

others believed things like this
- I used to believe that if you ate carrots you’d have night-visionAnon
- I thought I had X-ray vision and could talk to animals and they could understand me.— Kitty Lover
- I used to think a clitoris was some sort of dinosaur.Anon
- I used to think gladiators were meant to be some sort of alligator.Anon
- i used to think that being a prostitute was a religion. (sort of like protestant i guess?)Anon
- I used to see "End Road Work" signs, and thought they were a sort of protest.— Sebastian