What I fond interesting is that humans don't really have that much control over our eyes themselves (pupils grow or shrink, but otherwise it's just how we move them around), and yet they can be so expressive. It must be that all the various facial muscles are what add the deep meaning we find in eyes, and yet I think we remember eyes more than expressions.

Also, there is that feeling that you can tell something about a person by looking into their eyes, something more than by looking at their face. How is it that this relatively expressionless thing can carry such meaning?