Which literary device Dickens has used in the below given lines?
“Hard and sharp as flint, from which no steel had ever struck out generous fire; secret, and self-contained, and solitary as an oyster.” (Stave One)
To Dickens, oysters do not come in the packs or groups. This simile is really funny as it serves to add humor to the narrative as well as characterizes Scrooge. In fact, author gives the readers his picture as frightening, hard and solitary person.