I had that thing, that feeling I get when I see a white van barrelling towards me along one of those narrow lanes and I think, I’m going to swerve, I’m going to do it, I’m going to swing right into its path, not because I want to but because I have to. As though at the last moment I’ll lose all free will. It’s like the feeling you get when you stand on the edge of a cliff, or on the edge of the train platform, and you feel yourself impelled by some invisible hand. And what if? What if I just took a step forward? What if I just turned the wheel?