Artist Cesare Pietroiusti takes part in 1+1. Relational Art, the first major retrospective dedicated to the Relational Artmovement, held at the MAXXI Museum in Rome and curated by Nicolas Bourriaud, the French critic and theorist who first defined its principles in his 1998 essay Esthétique relationnelle. The exhibition offers a dynamic journey that transforms the museum into a space of relationships and interactions, restoring art’s role as a social and collective instrument. Through works, actions, and archival materials by international artists—including Vanessa Beecroft, Maurizio Cattelan, Dominique Gonzalez-Foerster, Carsten Höller, Pierre Huyghe, Philippe Parreno, Rirkrit Tiravanija, and Cesare Pietroiusti—the project traces the evolution of a practice that redefined the relationship between artist, audience, and context.