Well this article kills my pet theory, but I'll inflict it on the world anyway because this sort of stuff is fun to think about.<p>Before I go on, a couple of key points.<p>Also, spoilers ahead.<p>1. We don't see the space craft arrive.
2. Their choice of locations on Earth goes unexplained.
3. We don't actually see them leave. They just disappear.<p>I posit that the "aliens" aren't actually from "outer space". They're higher dimensional beings that exist in our 3D space (or 4D if you count time), but we simply cant perceive them in the same way a two dimensional being would not be able to perceive anything in the third dimension.<p>The "ships" aren't ships. They're something the "aliens" have created to project themselves into a 3D dimensional space so that we can perceive them. They're basically windows. When Amy Adams' character goes behind the "window", she can do this because her brain has acquired the capacity to perceive the higher dimension, and she no longer needs the window.<p>Their locations on Earth may mean nothing to us, but they are convenient places for them as they perceive the universe. A 2D being would not be able to fathom the reason 3D being makes marks on a 2d plane unless they could perceive the 2D plane form a 3D perspective.<p>Anyway, that was my theory. This article blows pretty much destroys it, but I like it anyway.