The following happened in December Juche 55 (1966) when President Kim Il Sung was having one-on-one talks with the General Secretary of the Communist Party of the Soviet Union.
As the talks were coming to an end, the General Secretary stood up with his hands on the desk and stooped to look at the notepad lying in front of the President, an act which was unprecedented in the history of diplomacy.
Amid the gaze of everyone there, the General Secretary asked the President what was written in the mysterious notepad that he spoke so fluently about the wide-ranging issues without referring to anything. Then he stared hard at the notepad shown to him.
All he saw were a few triangles and a few lines of writing.
He could not believe that President Kim Il Sung had not referred to anything except the notepad throughout the talks.
At a party that evening, the General Secretary said to the President:
“You are a 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.”