Flatland is an interesting way to think about dimensions. If we were living in a 2D world, anything living in the 3D world would blow our minds and do things we would think should be impossible.

https://en.wikipedia.org/wiki/Flatland

There’s also The Planiverse, with a different take on what a 2D world would look like.

https://en.wikipedia.org/wiki/The_Planiverse