From there, the digital designs are recreated on paper using paint brushes controlled by its two bionic arms. ‘AI God’ by Ai-Da will be up for auction from October 31 to November 7.

Now, and only now, you may pick up your brush. The Met’s new show about what happens next, “Siena: The Rise of Painting, 1300-1350,” makes clear how astonishing it is that paint, of all ...