Kreisleriana , Op. 16 (1838), considered one of Schumann's greatest works, carried his fantasy and emotional range deeper. Johannes Kreisler was the fictional musician created by poet E. T. A. Hoffmann , and characterized as a "romantic brought into contact with reality". Schumann used the figure to express emotional states in music that is "fantastic and mad." According to Hutcheson ("The Literature of the Piano") , this work is "among the finest efforts of Schumann's genius. He never surpassed the searching beauty of the slow movements (Nos. 2, 4, 6) or the urgent passion of others (Nos. 1, 3, 5, 7) […] To appreciate it a high level of aesthetic intelligence is required […] This is no facile music, there is severity alike in its beauty and its passion."