Board Thread:Speculation House/@comment-216.239.28.98-20140422001233/@comment-24891101-20140717054055

I'd call the lack of visible variation a production shortcut. I've mentioned elsewhere my hypothesis on Grimm creation, which is that they sorta just ... appear in the wild places, where it is metaphysically Dark, and are drawn to souls like moths to flame, both desirous of and repulsed by the light of souls. (And I've just now realized that my thinking has been influenced by Ungoliant and her mystery.)