Can you imagine Simon as a kid? His imaginary friends probably never wanted to play with him.
Let's face facts, this is visual medium, there's a very high premium put on people who are good-looking. But the minute you rely on that you get yourself in trouble. You certainly don't make a career out of that anymore as an actor.
I don't want it to be all that self-conscious or artificial, but it really grows out of my having invented myself as a listener so that I could hear her voice.