If I tell you my character has grey hair, you will not see her. If I tell you she has a tiny scar at the upper left corner of her lip from which protrudes one grey whisker—you will make up the rest of her face with absolute clarity. If I tell you my character is waiting in a car, you won’t be ‘caught,’ but if I tell you he pushes his fingers down in the crack of the car seat where the ancient leather has pulled away from the seat frame, and pulls up a small coin purse with a faded note in it—you will be mine.