" It's how we read the face, said Ian. Remember that you're talking to a psychologist. We like to think about things like that. It's a question of numerous little signals that create the overall impression.
But how do internal states who themselves physically?
Very easily, said Ian. Think of anger. The knitted brow. Think of determination. The gritted teeth.
And intelligence?
Liveliness and engagement with the world. "

― Alexander McCall Smith , Friends, Lovers, Chocolate (Isabel Dalhousie, #2)