Have to hurry up posting, CeesnanCari sent it off-course again while you were typing, and as one of the cognoscenti there is no excuse for you doing so again.
Can I add that posts from those who DON'T get it will make it harder for everyone to work out the rule, but will give an opportunity for those who DO to keep the flow going.
As there seem to be a lot of serious threads at the moment, I am launching a new game. There is only one rule, very simple, but I am not going to tell you what it is. You will have to work it out for yourselves by reading all the posts very carefully.
When you think you have it, join in. All posts, from those who get it or from those who haven't a clue, influence the course of the game.