For the first half of this documentary, we are guided through a rather fleeting chronology of the development of Picasso's styles of artists through this "Rose" period, his "Negro" works and then "Cubism" and that's all pretty routine stuff. Then, though, we visit his seaside French home in a picturesque village where he proceeds to paint, as if directly onto the screen, and it's astonishing to watch. Random shapes, lines, squiggles and dots become plants, animals and people by the time he has finished what looks like the most rudimentary of styles of brushwork. There's a basic narration, but i...