Not a lore expert, so if anyone else challenges me on this, they’re almost certainly right.

The world was flat at one point, but canonically became round at the end of the second age (before LOTR). That said, some beings can still perceive the world differently. Primarily this is in reference to elves’ ability to just piss off and leave the world behind, but maybe all non-humans have some latent ability to see things humans can’t?

Flori-dor?