The following happened in December Juche 55 (1966) when President Kim Il Sung had one-on-one talks with the former general secretary of the Communist Party of the Soviet Union.
They discussed a wide range of serious issues arisen in many fields including politics, economy, culture and the military.
When it reached a final stage after many hours, the general secretary stooped to look at the notepad lying in front of the President and asked him what on earth was written in that mysterious notepad and how he could speak so fluently about the wide-ranging issues without referring to anything but that mysterious notepad.
All he saw were a few triangles and a few lines of writing.
At a party that evening, the general secretary said to the President:
“You are a peerlessly great man with wide-ranging knowledge, Comrade Kim Il Sung. I have met many heads of state and other people, but never such a universal genius as you.”