Admittedly, I am playing fast and loose with the guide for today. That's because, well, the subject of this picture isn't technically a stranger. But she is:
Simple. I don't really know who she is yet. Well, I know who she is right now, but I don't have a clue who she's going to be when she grows up. How much of her personality will stick with her? How much is really just a toddler phase? Heck, at this point, I don't even know what hair color she's going to wind up with--my mother said my hair was that light brown until I was about three or four, and then it darkened to its current not-quite-black. Experience indicates she will lose those sweet little curls at the base of her head, but the other girls didn't have anywhere near that much hair at her age, so who knows?
Who knows? That's the question of parenting, and the reward. These little people spring from you fully formed, with a definite indication of personality even before they are born, but it takes decades to find out who they're going to become.
I'm quite privileged to get to watch this metamorphosis a fourth time.