there is some controversy on how to colour the faces of this polyhedron. although the common way to fill in a polygon is to just colour its whole interior, the middle of the pentagrams are over empty space, as can be seen from the picture of the great dodecahemicosahedron above. hence, some, such as jonathan bowers, do not fill in the middle of the pentagram: this filling has been called "natural filling". in the natural filling, orientable polyhedra are filled traditionally, but non-orientable polyhedra have their faces filled with the modulo-2 method (only odd-density regions are filled in).