My mom believed, when she was little, that we lived on the inside of the world. This belief stemmed from the fact that the sky is blue, and pictures of the Earth are mostly blue. So basically, she believed we were staring up at the Earth's shell.
A childhood belief about landscape

others believed things like this
- I used to believe that the sky is just a very thin blue egg shell— Alan
- The song "Reverend Blue Jeans" turned out to be "Forever in Blue Jeans." Who would have believed that?— music lover
- I used to believe that we lived inside the earth!— Natalie Howley
- I used to believe that human lived inside the planet earth and not on its surface.— Giancarlo
- Eifel 65 - Blue
I'm Blue (if I was green I would die...)
[I'm blue, da ba dee, da ba di.]— Matt - I believed that 4 p.m. was pink, and 5 p.m. was blue. I don`t know why.— blue