Chris, you and most of your commenters live in a world totally foreign to us mere mortals. But, I'll pose a challenge and see if it gets any takers.

Imagine an app which turns the screen of your i-phone into "glass". That is, no matter where you point it and no matter (within limits) what angle/distance you look at it, what you see is exactly what is behind the phone, as if you are looking right through it. Obviously this requires more than the rotation, camera, and GPS, for example, sensors for the phone to know were your eyeballs are.

The app could then layer information over the image to show you, for example, where the sun is exactly on a cloudy day or after sunset. Or planets day or night. Or tunnels under your feet. Or... (fill in the blank!) Aaron