This from Rory is so good that I wanted to give it more prominence on the page:
This came up earlier. I don't know if the Johari window is still taught in introductory psych courses. It's a fairly simple concept.
Imagine a square. In that square is everything there is to know about you.
Imagine a horizontal bar in that square. Above the bar are the things you know about yourself. below that bar are the things you don't know about yourself.
There are a million things you don't know about yourself. Some are obvious: how you will act under pressure you have never experienced; things you have never learned to see. Some bring up some deep denial: all the things you think are cool but annoy others; all the times you are playing to an imaginary audience as you interact in life.
RM