Presented at the 12th São Paulo Biennial (1973), at the height of Brazil’s military dictatorship, this project comprised a series of radical, participatory actions that sought to create symbolic and utopian spaces for free popular expression within mass media and public space. Operating under the cover of art, the work challenged censorship and state control through collective engagement.

The interventions included a nationwide telephone call-in system using specially installed lines; blank newspaper spaces inviting reader responses; and radio and television broadcasts that orchestrated unexpected acts of public participation, such as a taxi rally through the city. These were complemented by a videographic “mini-museum of consumerism” and a street demonstration in which participants carried blank placards bearing the slogan “The City Invaded by Blank Space.”

The final action resulted in the artist’s arrest by the political police, underscoring the project’s direct confrontation with authoritarian power. Awarded the Biennial’s Grand Prize in Communication, the work stands as a landmark example of media-based, socially engaged art as a form of political resistance.