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The Hidden Face variation
I'm using the term "hidden" loosely, here. The faces are obviously there, but they're not there, you get me? It's more of a visual pun than a metaphor and in general there isn't a lot of meaning to it aside from the fact that sometimes it's just cool to see a face made out of things that aren't supposed to make a face. It's a popular image for horror movies, as you can see. I had a lot to choose from actually, so just know you're only seeing the tip of the Hidden Face iceberg.