John Baldessari is one of the pioneers of conceptual art, which revolutionized contemporary art in the 1960s, and is still a profound influence on young artists today. The film shows John Baldessari in all aspects of his work: as an artist in his studio, with the technicians he collaborates with, as a teacher interacting with his students, as a passionate observer of the contemporary scene and visiting the Biennale in Venice as well as the Basel Art Fair. The film provides us with insights into the work of a radically modern-thinking artist and sharpens our perception of the often inaccessible world of contemporary art.