Mexico has been photographed since the nineteenth century, when the technology was first developed. During the Porfiriato, Díaz realized the importance of photography in shaping the understanding of his regime and its accomplishments.  The government hired Guillermo Kahlo (father of painter Frida Kahlo) to create photographic images of Mexico's new industrial structures as well as its pre-Columbian and colonial past.  Photographer Hugo Brehme specialized in images of "picturesque" Mexico, with images of Mexican places and often rural people.  During the Mexican Revolution, photographers chronicled the conflict, usually in the aftermath of a battle, since large and heavy equipment did not permit action shots. Agustín Victor Casasola is the most famous of photographer of the revolutionary era, and he collected other photographers' images in the Casasola Archive; his vast collection was purchased by the Mexican government and is now part of the government photographic repository, the Fototeca. After the revolution, Mexican photographers created photographs as art images.  Among others, notable Mexican photographers include Manuel Álvarez Bravo, Héctor García Cobo, and Graciela Iturbide.