A nut found itself carried by a crow to the top of a tall campanile, and by falling into a crevice succeeded in escaping its dread fate. It then besought the wall to shelter it, by appealing to it by the grace of God, and praising its height, and the beauty and noble tone of its bells. “Alas,” it went on, “as I have not been able to drop beneath the green branches of my old Father and to lie in the fallow earth covered by his fallen leaves, do you, at least, not abandon me. When I found myself in the beak of the cruel crow I made a vow, that if I escaped I would end my life in a little hole.” At these words, the wall, moved with compassion, was content to shelter the nut in the spot where it had fallen. Within a short time, the nut burst open: Its roots reached in between the crevices of the stones and began to push them apart; its shoots pressed up toward the sky. They soon rose above the building, and as the twisted roots grew thicker they began to thrust the walls apart and force the ancient stones from their old places. Then the wall, too late and in vain, bewailed the cause of its destruction, and in short time it fell in ruin.
LEONARDO DA VINCI, 1452–1519