<_description>
Parametric surfaces.
http://mathworld.wolfram.com/DinisSurface.html
https://en.wikipedia.org/wiki/Enneper_surface
http://mathworld.wolfram.com/EnnepersMinimalSurface.html
http://mathworld.wolfram.com/KuenSurface.html
https://en.wikipedia.org/wiki/Moebius_strip
http://mathworld.wolfram.com/Seashell.html
http://mathworld.wolfram.com/SwallowtailCatastrophe.html
http://mathworld.wolfram.com/BohemianDome.html
https://en.wikipedia.org/wiki/Whitney_umbrella
http://mathworld.wolfram.com/PlueckersConoid.html
http://mathworld.wolfram.com/HennebergsMinimalSurface.html
http://mathworld.wolfram.com/CatalansSurface.html
http://mathworld.wolfram.com/CorkscrewSurface.html
Written by Andrey Mirtchovski and Carsten Steger; 2003.