Authors do read as well, and they are special readers. They are creators: litterateurs are artists whose medium is language. The scholarly production also has a hint of creativity: the only fact to produce a new text about a certain subject is an act of creation. The way we treat a particular topic, the moment we decide to treat it, the perspective we adopt, the links we tie with other realities, data or ideas... all these circumstances contain a varying degree of creativity. Nothing is lost, nothing is created, everything is transformed: we only reshuffle material seen, heard, read, or lived elsewhere. Thus, authors’ libraries are extremely informative: the books owned by a certain author tell a lot of his/her tastes and subjects of predilection, but also of his/her past, present and future (possible) works.