You’ve said that when you started thinking about the book 18 years ago you felt you couldn’t understand anything about society unless you understood revolutions. What gave you that feeling?
In my mid-teens I developed an obsessional interest in revolutions. I thought of this as a political stance, although when I look back on it now I realise that the idea of “the world turned upside down” was attractive to me because I was miserable and I wanted the world to be different and I...