Yes.
The world is split more or less into a concentric circle.
The innermost is called the Real. Everything there is a 3-D geometric object. Most of the Geoms reside there.
Then you have the second, which is the Semi-Real. Everything there is a two-dimensional geometric object residing in three-dimensional space. It's.. interesting. Any Geoms that go there become 2-D. Cylindials can't go there, as they do not translate from their normal forms (Cylinders and Cones) to anything flat.
Then you have everything else.. which is the Unreal. Things from there
aren't geometric shapes. They're one-dimensional creatures trapped in a three-dimensional space. The fact that they have to move in three dimensions drives them to crazed extremes of the mind. To us, they'd look like demented, ever shifting lines- constantly forming new images and shapes.
They want to kill all the Geoms, which causes the two groups to fight.
“She'd become a governess. It was one of the few jobs a known lady could do. And she'd taken to it well. She'd sworn that if she did indeed ever find herself dancing on rooftops with chimney sweeps she'd beat herself to death with her own umbrella.”
― Hogfather