“But such subtle things that you could basically read it into any normal person’s behaviour – mild depression, anxiety, insomnia, fatigue. All of which I had, by the way.’‘What were the more specific signs?’‘There was one that always stuck in my mind. It was a bit like a Rorschach blot, only with words. The person was asked to name the similarities between an apple and a banana. A healthy person would say they were both fruit, but in people prone to psychosis, they wouldn’t say the obvious . They’d say something like “They both have skin”.”