Is this information you know? Information you don’t know? Or information you don’t know you know? I’m talking about the Johari window: a two-by-two table that is supposed to clarify (and what overwhelmingly complex phenomenon can’t be made instantly comprehensible by a little two-by-two model?) what is known or not known about you by you and by others. A version of this idea was famously used by Donald Rumsfeld while he was US secretary of defence. He spoke about “known knowns”, “known unknowns” and “unknown unknowns”.