Ahem.
We shall now discuss Non-Euclidean geometry, as explained by Howard Phillips Lovecraft.
AKA, mindfuck.
Let's begin. MWAHAHAHAHAHAHAHA and so forth.
Imagine a normalish city scene.
Now map it onto a sphere, and pound the bottom of the sphere up to make the ground.
Here's where the fun starts. Randomly protrude the sphere to be 4-dimensional. This makes the 2-dimensional texture that is the city applied on the inside of the concave sphere become 3-dimensional.
These 3 dimensions self-protrude to become 4-dimensional, to match the sphere and make the insides of the buildings.
The sphere, restating its authority, protrudes to become 5-dimensional. This makes the texture protrude to 5 dimensions, which in turn causes the sphere to protrude to 6 dimensions, which causes the texture to become 6-dimensional, and so forth.
And that's how Cthulhu's city of R'lyeh was built.
GAZE UPON MY THEORY AND IMPLODE.
Goals accomplished: made suo's brain hurt. \o/