Gene Davis' Apricot Ripple; ArgosIsland's untitled photo submitted via Twitter. Gene Davis/Smithsonian American Art Museum; ArgosIsland/Twitter hide caption

itoggle caption Gene Davis/Smithsonian American Art Museum; ArgosIsland/Twitter

Cosmo Wenman generated this 3-D model of the Ares Borghese, based on hundreds of photos, from the Basel Sculpture Hall. Wenman publishes the scans online, so that anyone can use them to 3-D print a replica of the masterpiece. Courtesy of Cosmo Wenman hide caption

itoggle caption Courtesy of Cosmo Wenman

Alex Ruger, director of the Van Gogh Museum in Amsterdam, at the unveiling Monday of Vincent Van Gogh's Sunset at Montmajour. Olaf Kraak /AFP/Getty Images hide caption

itoggle caption Olaf Kraak /AFP/Getty Images