We'd talk about Christopher today as falling 'somewhere on the autism spectrum,' though Haddon would prefer we thought of him simply as 'an outsider,' a stance that makes the story that much more of a relatable experience. This kid up on stage, as portrayed by the nimble Sharp? Well, he's me. And my friends. And probably you, too, on any day when you feel overwhelmed, or more than a little obsessive-compulsive.