Twilight shot her a venomous glance, and continued.  “As he fine-tuned his spell he found that some lines faded, and some new ones appeared.  Eventually he plotted all these lines and found that throughout the range of his spell, only one remained constant.  He believed this to be our line, the line that represented our universe.  This in no small way created a lot of controversy, as it implied that each other line represented a different universe.  Nopony really wanted to believe that realities other than this one existed, and the theory was roundly dismissed by most scholars and magicians.  But as time went on, evidence began to pile in his favor.  And thus began the frantic attempt to 'jump' into another universe.  Needless to say, Nopony had ever been able to accomplish the feat.  Not even Arcturus himself.  After such mass speculation and disappointment, the lifestreams faded in the minds of pony kind to little more than a natural curiosity.”