The exhibition web site for Edward Hopper, from the Museum of Fine Arts Boston, features a slideshow of a dozen of Hopper's paintings, and a digital version of one of the artist's sketchbooks. Some Hopper paintings, for instance Nighthawks, 1942, have been reproduced so many times and in so many formats - posters, prints, t-shirts, coffee mugs - that they have become iconic and these are included in the slideshow. The sketchbook offers a more uncommon glimpse of Hopper's work: the pencil studies that led to his paintings, meticulously annotated by his wife, Josephine Nivison Hopper, his only female model. Another plus of the sketchbook is the ability to turn the pages online, and zoom in on details.