Vincent Van Gogh’s pen-and-ink drawings are every bit as astonishing and expressive as his famous paintings, yet amazingly, there has never been a major U.S. exhibition of the drawings. That changes this week, when New York’s Metropolitan Museum of Art puts 113 Van Gogh drawings on exhibit. The works have been borrowed from various public and private collections, and will likely not be seen in public again anytime soon, due to the relative fragility of pen-and-ink works.