"Secret, and self-contained, and solitary as an oyster."
* Simile emphasises how Scrooge locks himself away from society + others, presenting him as lonely + unwelcoming.
* Sibilance gives sinister tone
* Adjective 'solitary' later in the text when Scrooge revisits his childhood
as a lonely boy could have been used by Dickens to show that money cant buy happiness and using it to award Scrooge sympathy- it was not his choice to be lonely as a child
* This simile could also represent Scrooge having a softer inside + a pearl foreshadowing Scrooges transformation