COVE

Verrocchio's lantern and the bronze ball reside at the top of the Florence Duomo (or Brunelleschi's Duomo). Da Vinci was an apprentice of Verrocchio at the time of the construction of these finishing pieces and is thought to have contributed to the project. 

Attribution: https://search.creativecommons.org/photos/726ec679-89d0-4ff1-b3f7-a2ad38...