Leonardo da Vinci · every age

What was Leonardo da Vinci doing at 57?

Painter, anatomist, engineer. Started the Mona Lisa at 51

1. c. 1509

   His solids drawings appeared in Pacioli's Divina proportione

   He had studied mathematics with Pacioli in the 1490s.

   Source: en.wikipedia.org

Portrait: Drawing believed to be a self-portrait, Leonardo da Vinci (c. 1510), public domain, via Wikimedia Commons · source