A crow perishing with thirst saw a pitcher, and hoping to find
water, flew to it with delight. When he reached it, he discovered
to his grief that it contained so little water that he could not possibly
get at it. He tried everything he could think of to reach the water, but
all his efforts were in vain. At last he collected as many stones as
he could carry and dropped them one by one with his beak into the pitcher,
until he brought the water within his reach and thus saved his life.
Necessity is the mother of invention.