Years ago, a retired vicar told me about this.
It’s a way of thinking about who you are … using a diagram with four sections
It’s all about self awareness. The window is divided into four quadrants, with each quadrant having to do with feelings. or information, or motivation
Things I am aware of about myself that I am prepared to reveal to others
Things I am aware of about myself that I keep hidden
Things I am not aware of about myself that others see
Things I am not aware of about myself that no one sees.
Have a look here if you want to explore more
Five Short Words 