I saw the young one first, then I screamed when I saw the old one.
Now that I see the way you put it, I never realised that that was what I had been doing all along .. thinking about thinking. I'm always doing that, always trying to figure out why someone else doesn't see things the way I do and vice versa, and maybe go as far as trying to think the way others would think.
This is one of the many reasons why I love thinking, not only does it make you feel alive, and human; you also realise why we are the way we are, when I was a muslim I would have added -
why we are the way Allah has made us - but now it feels so much more powerful and beyond our unlimited yet limited imagination that the way we are is from evolving from prior species.