What are some analogies for the word cooperation?

Think of two cylindrical objects, perched on the wall, on a day with no wind to blow them off. They are placed a centimetre apart from each other, and they both want to reach the ground. Somebody is standing behind the cylinders, and they can only push one of them off, whichever one they push, the other will not move. Now imagine the same picture, but the two cyllinders are connected by a smaller cylindrical pipe. If the person standing behind should push either one of them, they will both reach the ground, they have co-operated by joining together, to reach their goal.