A recurring dream. A dream that will not go away. And I'm willing to bet that in some form or another--you have it, too. It's pretty standard: I'm flying. And sometimes I hit the ground screaming.

One might call this an archetypal dream, a trope of the "collective unconscious." The dream of flight may well represent our collective drive to soar as a species, raising questions like where are we flying to? And from where will...