In Paul Auster's book "Leviathan," the character Sachs undergoes a profound transformation over the span of fifteen years. His journey takes him on such an extensive path that by the end, he has completely lost touch with his original identity. The physical and emotional distances he traversed left him unable to recall the person he once was, highlighting the impact of experiences on self-perception.

This exploration of identity reflects the broader theme of how life changes us deeply, often to the point where we no longer recognize our former selves. Auster captures the essence of this transformation, emphasizing that the experiences we endure can reshape who we are in fundamental ways, sometimes rendering our past selves almost unrecognizable.