Walter Benjamin's 'The Work of Art in the Age of Mechanical Reproduction' explores how mass production and mechanical reproduction of art alter its unique presence and authenticity, referred to as 'aura'. He discusses the shift from cult value, where art was tied to ritual and tradition, to exhibition value, which democratizes art and allows it to be used for political messages. This transition has both positive aspects, such as wider accessibility, and negative implications, including diminished perceived value and potential misinterpretations.