Hendecahedron surface design

There are 3 main designs named: Plumage, Venation and Apertures. 

Plumage series are devised from a single curve line in the middle of each surface, then blend to the edge. 2 variations of plumage named Plumage Continuity and Plumage Flow produce different kind of feather-like apertures on the surface.

In Plumage Continuity, the continuous line (in green) will be embossed on the surface.

Venation is based on the structure of the veins on a leaf in response to the edges of the Hendecahedron as the main veins.

Apertures is simply testing the surface with different sizes of apertures.