“German assistant who was supposed to be helping him construct his mirrors and produce some for the wardrobe rooms of the pope and Giuliano. But he was disloyal, lazy, and erratic, causing Leonardo to go into a tailspin of rage. He became physically ill as well as petulant, and his psychological unhinging was splayed out in three long drafts of complaining letters intended for Giuliano. This was not the first time that Leonardo’s bouts of torment seemed to spiral out of control. Back when he was in Milan, he had walked off the job of decorating rooms for the duke, drafted a fiery letter of complaint, and then torn it in half. But the letters he drafted for Giuliano were of a different order of megatonnage. He told the stories of his clashes with the German in lengthy and disjointed diatribes that verged on the paranoid and were cluttered with details and Isaacson, Walter. Leonardo da Vinci (p. 460). Simon & Schuster. Kindle Edition. ”
