User blog comment:D.Ryan/Will Andrew Ryan make a Cameo Appearance in Bioshock Infinite?/@comment-1500935-20110611201512/@comment-939754-20110611233432

What gives you the idea they must be alternate dimensions? They haven't yet directly stated what tears are. It's only been the assumption of reviewers. Some can be alternate dimensions, but also other times. I believe they occur in the same world, just at different times. Maybe the thought of a failed flying city inspired Ryan to create an even more isolated one. Who knows.

But I wanted to think Rapture would appear through a tear.