It's been way too long

I haven't written anything here for over a year, wow, doesn't seem like it has been that long.
I had a random thought the other night, and I would like to know how you would answer my thought.  If you had two sentences to describe to someone who has been blind their entire life, what it means to see, how would you do it?  Or likewise, someone who has never heard a sound before, what sound is?  I can't answer my own thought.