Tiling
...?
Spherical Dodecahedron
a.k.a. pentagonal tiling of the sphere
+ Stereographic Projection
= Stereographic Dodecahedron
Rotation
...of what?
z \mapsto \frac{i (z+1)}{z-1}
The Hyperbolic Plane!
4-D Rotations
Enneper’s Surface
Möbius Band
Geodesic
Acute Triangles
Drum
Catenoid/Helicoid