"Let's have a game, you and I," Roland proposed. "You try to get into my head and see who I'm angry at. I'll try to keep you out."
Jake shifted position slightly. "That doesn't sound like a fun game to me, Roland."
"Nevertheless, I'd play against you."
"All right, if you want to."
Jake closed his eyes and called up an image of Roland's tired, stubbled face. His brilliant blue eyes. He made a door between and slightly above those eyes-a little one, with a brass knob-and tried to open it. For a moment the knob turned. Then it stopped. Jake applied more pressure. The knob began to turn again, then stopped once again. Jake opened his eyes and saw fine beads of sweat had broken on Roland's brow.
- The Dark Tower page 312