Interpretations of 2001: A Space Odyssey onto it all manner of ideas relating to the film. The Monolith in the movie seems to represent and even trigger epic transitions in the history of human evolution, evolution of man from ape-like beings to civilised people, hence the odyssey of mankind. Vincent LoBrutto's biography of Kubrick notes that for many, Clarke's novel is the key to understanding the monolith. Similarly, Geduld observes that "the monolith ...has a very simple explanation in Clarke's novel", though she later asserts that even the novel does not fully explain the ending. "Rolling Stone" reviewer Bob McClay sees the film as a four-movement
2001: A Space Odyssey (novel) trying to tell us something?" Clarke himself directly addressed the spelling issue in chapter 19 of "The Lost Worlds of 2001", explaining that he simply (and unconsciously) used the spelling he was familiar with from "The Conquest of Space" (1949) by Willy Ley and Chesley Bonestell, presuming that the "J" form is the German rendering of the Greek. The film "2010" was released in 1984 resulting in movie tie-in editions of both the "2001" and "2010" novels. At the time Signet Books reported that over 2.8 million copies of "2001" were in print and that "2010" was one of 1983's