I See Invisible Things

The title character of Baum's story, "The Glass Dog," is oddly enough a dog made of glass. So how on earth do you draw with ink a character you can see through? Here's a couple of ways Neill did it. The glass cat appears in a bunch of Oz books (famously proud of her pink brains -- "you can see them work!").

To me, that doesn't really look transparent. In Neill's color illustrations of the glass cat look a transparent, but a little FLAT, almost like a drawing on the wall:

(And...where's the pink in her brains?)  So, on our color cover of The Glass Dog, we're imitating this look:

But the problem for us is that the rest of the book is in black and white.  This makes it much much harder to create a transparent character, as Neill knew all too well.  We're borrowing Neill's idea that you can see the background through the dog's body, and hoping that gives enough of an illusion of the dog being made of glass.  Like this: