You begin looking towards a shelf. Turn all the way around and move towards the shelf on the right hand of the exit, and then turn slightly left and move out into the middle of the hall. Once you're in the middle of the hall move into the doorway across from the one you exited, but then turn around to your left and move out of the central exit. Outside of the central exit of the area you were just in you should see a large number one near the head of some stairs. You're going to go down those stairs, to the left side of the first landing. Once you are on the left side of the first landing down those stairs, you are done.