Once upon a time, there was a crow called Coco who was feeling very hungry and thirsty. One hot summer day when he was feeling almost faint with thirst, he noticed a pitcher below him and immediately flew down to see whether it contained any water.
When he got near it, he found that there was little water in it, and that the neck of the pitcher was too small for him to put his beak inside. But Coco was not the crow to be easily daunted; he turned away to think, and soon came back again.
The first thing he did was to try to push the pitcher over, but after much hard work he found that he could not lift it off the ground. Then he noticed some pebbles lying in the street. So he said: “If I throw up these pebbles one by one into the pitcher, they will gradually make the water rise, and then I shall be able to quench my thirst.”
So Coco threw in the first pebble. Then he threw in another and another, and at last, by working very hard, he brought the water so near that he was able to put his beak into it and enjoy his well-earned draught.
Necessity is the mother of invention.