Tresset’s robots use computer vision to identify their subjects—they can recognize faces—and then they spend about 30 minutes on each portrait. (One of his earlier-generation robots, Pete, will actually doodle when there are no faces in sight to draw.) The early versions were crude and involved not physical robots but simulated drawing created with computer-aided drafting programs. But over the past 10 years or so, Tresset and Frederic Fol Leymarie, his co-director at the Aikon project at Goldsmiths University of London, have made tremendous progress. Can you tell which image below was made by a computer and which was created by Tresset before he lost his inspiration?