The Refectory of the Imperial Asylum at Vincennes. Artist: Charles Nègre (French, 1820-1880). Dimensions: 34.2 x 42.5 cm (13 7/16 x 16 3/4 in.). Date: 1858-59.Gathered in the light-drenched refectory of a newly constructed convalescent hospital on the outskirts of Paris, patients and staff alike turned their eyes and attention to the man with the enormous camera at one end of the room, Charles Nègre. The resulting image, here in a rare unmounted and unretouched proof print from the artist's studio, is the largest and most engaging in a series of photographs that Nègre was commissioned to make as documentation and celebration of the Imperial Asylum at Vincennes. The hospital was established by Emperor Napoléon III to provide those injured on the construction site or in the factory--"the worker's true field of honor," in the words of one of Napoléon's ministers--with care comparable to that given to the nation's military veterans. <p>Trained as a painter in the same studio as Roger Fento