The José Guadalupe Posada Collection of the Ibero-American Institute, Prussian Cultural Heritage Foundation - a Case Study on Digitization and its Impacts on the Work in Libraries. Digitization in a broader sense and digitization of printed cultural heritage especially have brought about many changes regarding the tasks and responsabilities of research librarians. New ways of thinking and acting are required as the objects and their mobile and connective qualities come into focus. These alterations stand in such contrast to the traditional 'librarian', that the concept of the 'embedded librarian' has arisen. A digitization project completed recently at the Ibero-American Institute in Berlin will serve as an example to shed some light on this new phenomenon of librarianship.