Why does this happen?
The point is that the problem is not in the enigma itself, the problem is in our own mind. When we realize this, just try to change our way of thinking and then we are able to get to the solution.
This may sound simple (although really is), but we should also remember that it’s quite easy to fool ourselves. Our brain is simultaneously powerful and treacherous.
Still, things are just things scattered around in space and time. It is up to us to give meaning to them. It is up to us to see them as a problem or as a challenge.