In Absentia, released in 2002, is a pivotal album by progressive rock band Porcupine Tree. The album combines complex compositions with accessible melodies, blending elements of progressive rock, metal, and ambient music. Themes of human psychology and modern alienation are explored in tracks like "Trains" and "Blackest Eyes." In Absentia is praised for its rich production and songwriting, marking a high point in the band's evolution and influencing the progressive genre.