[She catches the ball and absently begins to reel the string back in, tugging it out of Rose's fingers from her end.]

At one of multiple paths leading out of Luministi. If you attempt to proceed past this point, you will appear at a corresponding point on the opposite side of town.

Think of it as an standing transportalizer, only instead of being useful and letting you know what it is via uniform construction and embellishment across devices, it's invisible and doesn't go where you want it to while dangling unattainable distances in front of you every day in clandestine mockery of free will.