"Lateralus" is the third studio album by the American rock band Tool, released in 2001. The album is known for its complex rhythms, intricate time signatures, and philosophical lyrics, exploring themes of personal growth, spirituality, and the human experience. It features a blend of progressive rock and metal, showcasing the band's unique sound. The title track, "Lateralus," is particularly notable for its use of the Fibonacci sequence in both its lyrical structure and musical composition. The album received critical acclaim and commercial success, solidifying Tool's reputation as a leading force in the progressive rock genre.