 Allis and Koetsier (1991) argued that only the first response is justified because of a reasonable “principle of continuity”: that the positions of the balls in space are a continuous function of time. Without such a principle, the positions of the balls outside the jar could be allowed to teleport discontinuously back into the jar as soon as the supertask is complete. But with such a principle in place, one can conclude that the jar must be empty at the end of the supertask. This principle has been challenged by Van Bendegum (1994), with a clarifying rejoinder by Allis and Koetsier (1996).