Las quejas (The Complaints) is an on-going project to collect and compile complaints received by educators from a variety of museums, regarding their work mediating audiences. The documents that make up this archive expose the tensions and problems that arise during the mediation processes of cultural institutions. Since educators mediate between visiting members of the public and the institution itself, difficulties may come from either side. Educators from a number of Spanish cultural institutions were asked to participate in the project, including Reina Sofía, CGAC, Museo del Prado, and finally MACBA, where the artist himself received the complaint that sparked off the project.