“This link(via Boingboing)”:http://www.gutenberg.net/dirs/1/2/9/6/12962/12962-h/12962-h.htm is a complete, short, Project Gutenberg reprint of a booklet of half a dozen Victorian hand shadow postures. You see the hand in the foregrounds, and the animal in the background. That’s it. You don’t see the shadow even in the instructions to cast it. You see the animal, just as clearly as they saw in Lascaux.
It’s a sight worth keeping in mind, when thinking about metaphor, or God.