Biblioteca Abierta (Free library) seeks to reprogram public space, transforming places into libraries built without walls. Thousands of books are available on the floor that people can take freely. It is a work that changes with the action of the viewer and is transformed according to its disappearance. This work aims to create spaces for gather people through the exchange of books. Taking these texts abroad is an invitation to knowledge and citizen participation, developing new dialogues within the public space. The objective of this project is to program public space in segregated areas of the cities, making this intervention a replicable strategy in multiple places around the world. Its simplicity is the key to generate systematic changes.