The Crow and the Pitcher

A crow perishing with thirst saw a pitcher, and hoping to find water,
flew to it with delight. Upon reaching 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.