Robert Irwin – novelist, historian, reviewer and general all-round enthusiast and scholar of just about everything – died last year. It might seem odd that a man whose previous works included the definitive one-volume introduction to The Arabian Nights and a controversial critique in 2006 of Edward Said’s Orientalism – not to mention what is one of the great novels about Satanism, Satan Wants Me (1999) – should have spent his final years working on a book about stamp collecting.