Biblioteques de Barcelona is the public organization that manages all the libraries in the city. With more than 1 million users, its membership card (Carnet de Biblioteques) not only guarantees access to the libraries and book lending, but it also comes with a lot of cultural discounts and exclusive activities for its users.

We were commissioned a campaign to promote the secondary benefits of the card, not always known by its holders. With a simple multiplication trick, we conveyed the idea that the card is made of many cards that can be used in many cultural areas.