Why do we so often miss the obvious?

Why do our co-workers, children, and spouses miss what is clearly right in front of them? Why does our radar so often miss picking up the signals?

Here are two examples. They might work better if you click on the bottom right to make the video full screen. 

Watch The Flashing Green Spot
The lesson — from a flight instructor — is to not stare at a single point on the horizon, but rather scan the horizon. Otherwise, you risk missing items that are nearly in front of you.

 

 

Count The Passes
Turn up the volume for your instructions… 

 

Why are built to miss the obvious?
I don't know. Ask Darwin. Or Mother Nature.