Evolutionarily Drawn to Nature?

I've often felt the same way about campfires. What is it about a campfire that makes people want to sit around and stare into it? I'm not really talking about the idea of using it for warmth, or the social aspect of it...I talking about how, if you start a campfire, people will show up, sit down, and stare into it. Sure, every once in a while, somebody will poke at it with a stick, toss on a new log, or whatever. But most people just sit there and stare. Obviously, it's our ancestral "fire gene" .