Ever heard of the Johari Window?

I came across the idea of the Johari Window during one of the presentations at the Bif-6 Conference. I'd never heard of it before. To me it's an interesting formalism to think about ones self knowledge. Reading about the Johari Window on Wikipedia (where else) but it was an interesting way to understanding personality.

"Room 1 is the part of ourselves that we see and others see. Room 2 is t he aspect that others see but we are not aware of. Room 3 is the most mysterious room in that the unconscious or subconscious part of us is seen by neither ourselves nor others. Room 4 is our private space, which we know but keep from others." (from Wikipedia)

Who knows if this approach (reminiscent a little bit of Myers Brigss) is well known, respected or in total disrepute. It spoke to me, so I thought I would share it.