Going up another half-flight of stairs, she comes to Norman's room. As we look at the worn toys, the filthy, unmade bed, we realize that we are inside Norman's mind. Then Lila pulls a book from the bookcase and opens it. However, we aren't allowed to see what it is.
Some secrets remain secrets.
We have learned more from Lila's explorations than she has. She descends the stairs only to see Norman coming up the path. She cleverly hides beneath the cellar stairs as Norman ascends, but then, to the screams of the audience, decides to inspect the cellar rather than escape. Unwittingly, we have been headed toward this moment for the entire film, and it does not disappoint. The swinging overhead light, stolen from The Picture of Dorian Gray , works perfectly, although Lila has to work a little too hard to set it in motion.