A number of the most iconic scenes from The Shining do not appear in the book.
The Grady family murders are discussed in the book, of course, but the girls aren’t twins and they aren’t seen by Danny in a vision as they are in the movie.
It’s become a classic scene that has been satirized and parodied many, many times in the years since.
The chances are that when you hear “The Shining,” the first thing that pops into your head the vision of the twin girls in the hallway as Danny rides around on his tricycle.