I don’t know why, but I love this sign.
It makes me think of a huge chunk of crumbling parmesan. If you look at it “in negative”, ie. the black being the background and the white being the drawing, it looks like a walking building with chunky little feet. As I ponder what I see in it, I forget that it’s warning me there is a risk of rocks falling on my car, or that I may drive into an already-fallen rock, and then I drive into one. Which is ironic.