Oh yes, I was a bit confused by the shape. Of course, it's a brain! That's what the mind is. You seem to have made a series out of these pictures. I love this for the same reason I love the heart picture. It's wonderfully detailed and perfectly shows what you're talking about.
I don't think these are meant to be like parts of the brain. It still wonderfully shows a person wondering about. Here, the cave seems kind of deeper. I love the big set of stairs. It makes you realize how small it can seem. Of course, it's still large from this guy's perspective.