Them

Perception.

It's a very funny thing.  How you perceive yourself, and how you are perceived by others.
I'm fascinated with how different the two views can be...

It's always worth it to tell someone when you have a beautiful perception of them, or something they have done. It's far too often that we don't share these things with people, and how else will they ever know?!

It makes a world of difference in who they think they are, who they think you think they are, who they think the world thinks they think you think you are. Or they are. Plus a few more yous and theys. And all of the above.