People never take the ice wall into consideration 
Discussion
Yes, I heard that the Moon and the Sun are also flat. 2D univers.
No, everything is a sphere except the Earth, the only one exception. And it just happens that they match the formula of Newton and momentum conservation to the millimeter but that is a conspiracy that cannot be proven because Newton worked for the Royal Mint, an institution that was kind of what is Nasa today.
🤪
But the ice wall came down when the Others got control of the dead dragon