Dream Cast/Production!
It's hard not to think about your book possibly being turned into a big-budget film, or even a Netflix, HBO, or Amazon Prime series. At least it's hard not to think about it for me, I love visual mediums. I know Stephen King has mentally cast certain actors into the roles of some of his characters, at least he used to. I remember hearing about his preference of John Voight or Michael Moriarty for the role of Jack Torrance in The Shining, or Bruce Springsteen for Larry Underwo