Possibility. That which is not, but could be: in the future, or in a world as feasible as our own. (perhaps more so?) When is a possibility a reality? It may not be a reality unless - and until - it comes to be, and, yet, might be a basis of reality, decisions are made on assumptions that a possibility has high probability of becoming reality. I see kids playing and feel the expanding field of possibility, and wonder when it starts to shrink, to collapse? When & why does possibility die?