When building a library it is essential that it be seen as a project. The most successful developments are often born of a simple idea with the various elements of the programme discreetly assembled around it. It is even more essential that the standards which underpin the construction should be overrun and replaced by the concept of a benchmark: a successful library serves as a role model. Associating the public with the project helps to adapt it more effectively for real users (and not for an imaginary public), notably over the question of opening hours. We are moving towards buildings on a human scale, where areas of conviviality will have their rightful place.