What was Picasso 's most mysterious and challenging painting and when was it created ?
Although Picasso himself later recalled , " I started painting in blue when I learned of Casagemas 's death " , art historian Hélène Seckel has written : " While we might be right to retain this psychologizing justification , we ought not lose sight of the chronology of events : Picasso was not there when Casagemas committed suicide in Paris ...