Picasso's final works were a mixture of styles, his means of expression in constant flux until the end of his life. Devoting his full energies to his work, Picasso became more daring, his works more colorful and expressive, and from 1968 to 1971 he produced a torrent of paintings and hundreds of copperplate etchings. At the time these works were dismissed by most as pornographic fantasies of an impotent old man or the slapdash works of an artist who was past his prime. Only later, after Picasso's death, when the rest of the art world had moved on from abstract expressionism, did the critical community come to see that Picasso had already discovered Neo-Expressionism and was, as so often before, ahead of his time.