Giovanni Ambrogio Maggiore (1550 – c. 1598): The Silent Sphere Maker Giovanni Ambrogio Maggiore, a Milanese ivory and wood turner of considerable renown, remains an enigmatic figure in the annals of Renaissance art history. Despite scholarly efforts to reconstruct his life’s narrative, much about his formative years and artistic trajectory persists as speculation—primarily fueled by the tantalizing glimpse offered by Leonardo da Vinci…