        “I don’t think earth ponies can see it like a unicorn can,” Trixie mused.  “Trixie can’t see what anypony else sees, of course.  But my father said it’s more like a feeling to him.  If you blindfolded Applejack, Trixie wagers she could go slowly through a forest without any difficulty, if the path was smooth.  How should Trixie know?  She didn’t graduate from a fancy unicorn school.”  Trixie turned and walked down the hallway toward her room, while Twilight just stood in the hall, lost in thought.  A germ of an idea was coming to her, and she wanted to wait until it was fully formed before she moved.  