Sounds fun and enlightening to try!!
"A 'Johari Window' is a metaphorical tool used primarily in self-help groups and corporate settings as a heuristic device to encourage people to open up to another in self-disclosure. The concept is related to interpersonal communications. When drawn, the Johari Window takes the shape of a square divided into four quadrants which are based on the interpersonal relationship criteria of whether information is or is not known by each of the two parties. The concept was invented by Joseph Luft and Harrington Ingram, who combined their first names to create the name. And if you really like a challenge, try the Nohari Window...."