Low pressure system over Iceland. Image from NASA, taken on 2003-09-04. source source
Cyclones in general have the shape of equiangular spiral.
In general, Spiral-shaped growths in nature are mathematicaly equiangular spirals.
adove: A snail, showing equiangular spiral.
More photos of seashells at Beautiful Seashells Exhibition.
Romanesco broccoli, exhibiting equiangular spiral and fractal geometry. ❐ Photo courtesy of Dror Bar-Natan)
A Hawaiian ferm. exhibiting Archimedes' Spiral. (photos courtesy of Dror Bar-Natan)
Great Mosque of Samarra, exhibiting Archimedean Spiral.
The neck of a unfinished violin. Such a spiral in ornament is usually called a volute.
Mathematics of Seashell Shapes.
Archimedes' spiral, Clothoid, Lituus, equiangular spiral.
