Julián Cortés Cavanillas is a distinguished figure in the realm of film writing and criticism, best known for his compelling work on the 1977 documentary "España debe saber." This pivotal film explores the socio-political landscape of Spain during a time of significant change, making it not only a critical piece of cinema but also a collectible treasure for enthusiasts of film history and documentary storytelling. Collectors are particularly drawn to Cavanillas's work due to his ability to blend historical context with cinematic artistry, offering a unique lens through which to view the evolution of Spanish cinema. "España debe saber" is often sought after in its various physical media formats, particularly on VHS and DVD, as it encapsulates a crucial moment in Spain's narrative and serves as an essential addition to any serious collector's library. Cavanillas continues to inspire a new generation of filmmakers and collectors alike, making his contributions to the medium invaluable.