REVIEW OF AURELIEN DJIAN HUSSERL ET L’HORIZON COMME PROBLEME. UNE CONTRIBUTION A L’HISTOIRE DE LA PHENOMENOLOGIE Lille: Presses universitaires du Septentrion, 2021

In his book, Aurelien Djian investigates the history of the concept of horizon in the evolution of Husserl's thought. Addressing the most fundamental concerns of phenomenology, Djian redefines the horizon considering themes such as coherence of experience, the reality of the world, and motivation. He suggests an approach to exploring the horizon grounded in a detailed analysis of Thing and Space lectures. A significant conclusion of Djians's book is that the origin of the horizon should not be attributed to Ideas I, but to these lectures. This discovery is not only of historical significance, but also opens up a new perspective on relations between the world, the incompleteness of external experience, and the fluidity of attention. Djian denies Saulius Geniusas' interpretation of “halo” and “background” as psychological opposites of the horizon, which functions in the domain of ontology. These phenomena are given as elements of experience temporarily left by attention, connected with actual ones. The consciousness of unfulfilled potentialities of experience ensures the coherence of experience, making the transition from actual to potential seamless. This paper covers Djian's conclusions and part of his work that goes beyond the content of the book. We also try to contextualize Djian's research and show the history of studies of the horizon in the philosophy of Edmund Husserl.