There is a moment in Sherlock Holmes: Crimes and Punishments where the detective has to identify a brand of cigar. “This scent is familiar to me, but in order to recognise it, I must combine my associations into one picture,” he says. You find yourself swivelling a stink cloud, aligning its wafting lines into a hidden image. Problem is, Holmes’ nose deals in broad stereotypes – it locates the stogie as Mexican in origin by arranging the smell into a picture of a sombrero. That legendary sombrero smell that all Mexicans have. I believe this one comes from Conan Doyle’s beloved story, The Case Of The Horribly Misjudged Minigame.