"I admit to being amused by Tea's bishop-as-book since he's named after a book character," says Castle. "Bishop-as-book can mean someone who likes books, or someone who's a more abstract intellectual type generally. Bishop-as-arrow can mean freedom of movement or restlessness, in a more narrowly focused way than the queen and without overt connotations of power. A generic knight makes me think of... I'm having trouble articulating it. Royal, what's your interpretation?"