Echos that tell you that you are observing something worth exp,
My 2 cents added.

The echos could be...

If you succeed, it echos, 'This observation garners insight'.
If you are not high enough it echos, 'This observation still confounds you'.
If you are too high in level it echos, 'This observation would have been profound in when you were less experienced'.

If you succeed in exploring, 'This exploration has merit.'
If you are not high enough, 'This dangers place holds no merit for you.'
If you are too high in level, 'This place trivial to you.'

Well anyway that's an idea... It would help to reinforce what knowledge you learn. So that after you have truly explored for the first time you can benefit from it later... I wouldn't expect a vets to spend countless hours looking over the same things character after character. That's illogical.

Just my thoughts.

P_N