Leonardo da Vinci wrote in his notebooks: It should not be hard for you to stop sometimes and look into the stains of walls, or ashes of a fire, or clouds, or mud or like places in which you may find really marvelous ideas.
Leonardo da Vinci wrote in his notebooks: It should not be hard for you to stop sometimes and look into the stains of walls, or ashes of a fire, or clouds, or mud or like places in which you may find really marvelous ideas.