User blog comment:Gardimuer/Information from the new BioShock Infinite demo/@comment-1982351-20110527042740

"Elizabeth has the ability to manipulate "tears" in the world to give existence to objects that otherwise would not be present...Many reviewers speculate that this ability may be connected to time travel or linking to alternate dimensions."

If Irrational ever decides to throw in a nod to the world of Rapture, this seems like a prime opportunity, provided the "tears" function this way.