Balzac experimented with this method throughout the thirty years he worked on "La Comédie humaine". It enabled a depth of characterization that went beyond simple narration or dialogue. "When the characters reappear", notes the critic Samuel Rogers, "they do not step out of nowhere; they emerge from the privacy of their own lives which, for an interval, we have not been allowed to see." Although the complexity of these characters' lives inevitably led Balzac to make errors of chronology and consistency, the mistakes are considered minor in the overall scope of the project. Readers are more often troubled by the sheer number of people in Balzac's world, and feel deprived of important context for the characters. Detective novelist Arthur Conan Doyle said that he never tried to read Balzac, because he "did not know where to begin".