In the hours that followed, I learned that Ademic hand gestures did not actually represent facial expressions. It was nothing so simple as that. For example a smile can mean you're amused, happy, grateful, or satisfied. You can smile to comfort someone. You can smile because you're content or because you're in love. A grimace or a grin look similar to a smile, but they mean entirely different things. Imagine trying to teach someone how to smile. Imagine trying to describe what different smiles mean and when, precisely, to use them in conversation. It's harder than learning to walk.
Patrick RothfussCould you help me catch the moon?” “I might be able to give you some advice,” the old man said reluctantly. “But first you should think this over, boy. When you love something, you have to make sure it loves you back, or you’ll bring about no end of trouble chasing it.
Patrick Rothfuss