Three grand pianos slowly make their way through the large exhibition space allotted to them, sometimes bumping into one another. These animate objects, which constitute offroad (2014), a work by the artist Céleste Boursier-Mougenot, appear to be living beings, each with its own behavior. They are perfect examples of behavioral objects, whose little-known history dates back to the avant-garde and the emergence of cybernetics. What exactly is a behavioral object? How can it be analyzed, understood, theorized, experienced, and how can we conceive of works that possess the faculty of action and reaction to their environment and public? Examining three works by Céleste Boursier-Mougenot, this book tackles these questions and defines a new field of research and practice. Contributions by SAMUEL BIANCHINI, CÉLESTE BOURSIER-MOUGENOT, JAIME DESIMONE, JEAN-PAUL LAUMOND, FLORENT LEVILLAIN, EMANUELE QUINZ, BÉNÉDICTE RAMADE, TREVOR SMITH, ELISABETTA ZIBETTI