Jonathan used to play a little 'solitare' game of some sort on paper with dots & circles ...and lines between them, like new logical 'sets'. He would sit, making arcane decisions, adding dots and other marks in patterns...I sat beside him at a meeting... (he could play the game and still follow everything that was going on)... and finally got up the courage to ask "does that have a set of rules?"

He hesitated, and said "yes, but they are hard to explain",...and that's all I ever learned about it. I have always wondered if it a game of his own invention, or something he picked up somewhere....

Damn, I miss that brillant curmudgeon!