Vincent van Gogh's famous self-portrait eyeing internet surfers from the screen of a PC The spectacular exhibition of John Singer Sargent " Sargent Portraits of Artists and Friends" at the Metropolitan Museum of Art in New York following the successful run of the show at London's National Portrait Gallery has been an eye-opener for Londoners and New Yorkers alike, offering insights in the art of portrait making but also in the nature of the most valued commodity of our times, celebrity itself.