Nevertheless, Stravinsky was a master of learned classical tradition and worked within its bounds. In his later work he adopted a more "Apollonian" neoclassicism, to use Nietzsche's terminology, although in his use of serialism he still rejects 19th-century convention. In modern visual art, Picasso's work is also understood as rejecting Beaux Arts artistic expectations and expressing primal impulses, whether he worked in a cubist, neo-classical, or tribal-art-influenced vein.