The Johari window is, quite unironically and quite without brand marketing, a foursquare field. That is, a two by two grid, where the rows and columns (both of them) interact with each other. It is a metaphor used to explain a knower's relation to the self - each of the four squares representing a mode of knowledge about the self.
The first square, top left, consists of what the knower and the people in the general vicinity both know. The second square, top right, consists of what the knower doesn't know, but the people nearby knows. The third square, bottom left, consists of what the knower knows but the others don't. And the fourth square, bottom right, consists of what no one knows.
Confusing? I know, right!
This window is usually used by psychologists and human resources people in order to clarify the epistemic truth that there are things we do not know about ourselves. And, moreover, that we can get to know these things by being social with others - they know things we don't. By interacting with others, we get a window into ourselves, and so on and so forth.
As teaching tools go, it's a classic.
The first three squares tend to be rather straightforward. Things we all know about me, things others know but I don't, things I know but others don't. Got it. But what about that last one? The things no one knows? What gives?
Here, the space for ideology opens. And, to be sure, for interpellation - for creating a subject that might or might not exist.
For instance: taxes. I don't know how much I'm supposed to pay, they don't know how much I'm supposed to pay. Nobody knows. But by imposing various forms of structural violence, knowledge about who I am are forced into being. In essence, they say this: You will find out how much money you are supposed to pay, and you will tell us, and then we will both know.
Suddenly, you are a taxpayer, regardless of whatever you and your peers knows you to be.
Ideology doesn't give too much of a care about what you think. It knows your mind, before it even knows about you. And it knows just what to do, should you happen to think otherwise. -