While I was at my 15-year college reunion this weekend, I found myself repeatedly describing my boys to old friends and peers who had never met them. I told variant stories, but ultimately spent time on their differences. The contrast helps illuminate their truths. Eventually, it became clear that the easiest way was this:

The boys are entirely different but made of the same things.

Yet, F is really going to need O to drag him into the ocean to play in the waves.

And O is really going to need F to remind him that they could drown while in there.