A thirsty Crow found a pitcher with a little water at the bottom, too low to reach. He could not tip it over. Then he had an idea: he dropped pebbles into the pitcher one by one. With each stone the water rose higher, until at last it reached the brim and he drank his fill.

Moral: Necessity is the mother of invention; little by little does the trick.

From Aesop's Fables, public domain.