In what place did Matisse reveal his painting " Blue Nude " , shocking the public ?
With the bizarre painting that appalled and electrified the cognoscenti , which understood the " Les Demoiselles " was at once a response to Matisse 's " Le bonheur de vivre " ( 1905–1906 ) and an assault upon the tradition from which it derived , Picasso effectively appropriated the role of avant - garde " wild beast " — a role that , as far as public opinion was concerned , he was never to relinquish .