There is so much confusion on this board, on 4chan and within our world in general about psychology and this man. His fundamental insight is that you, I, and every truly human subject that will ever exist "Lack" in someway meaning they feel incomplete or are missing something that someone or everyone else has. This can only even be temporarily fulfilled. This manifests itself in millions of ways, but once you understand this, psychoanalysis becomes a lot easier to understand. Of course, this isn't nearly all of Lacan, but its the lynchpin. You feel lack, your mother feels lack, the hobbo down street feels lack and most importantly, the cheerleader or jock at your high school feels lack in some way.