over, "The novel has very little of the poetry of the picture" and "lacks most of the picture's strengths", but that "it has to be read before one can understand the picture". Eliot Fremont-Smith reviewed the book positively in the New York Times, stating that it was "a fantasy by a master who is as deft at generating accelerating, almost painful suspense as he is knowledgeable and accurate (and fascinating) about the technical and human details of space flight and exploration". Differences from the film Although the novel and film were developed simultaneously, the novel follows early drafts of the film, from which the final version of the film deviated. These changes were often for practical reasons relating to what could be filmed economically, and a few were due to differences of opinion between Kubrick and Clarke. The most notable differences are a change in the destination planet from Saturn to Jupiter, and the nature of the sequence of events leading to HAL's demise. Stylistic differences may be more important than content-differences. Of lesser importance are the appearance of the monolith, the age of HAL, and the novel giving names to various spacecraft, prehistoric apes, and HAL's inventor. Stylistically, the novel generally fleshes out and makes concrete many events left somewhat enigmatic in the film, as has been noted by many observers. Vincent LoBrutto has noted that the novel has "strong narrative structure" which fleshes out the story, while the film is a mainly visual experience where much remains "symbolic". Randy Rasmussen has noted that the personality of Heywood Floyd is different; in Clarke's novel, he finds space-travel thrilling, acting almost as a "spokesman for Clarke", whereas in the film, he experiences space travel as "routine" and "tedious". In the film, Discoverys mission is to Jupiter, not Saturn. Kubrick used Jupiter because he and special effects supervisor Douglas Trumbull could not decide on what they considered to be a convincing model of Saturn's rings for the film. Clarke went on to replace Saturn with Jupiter in the novel's sequel 2010: Odyssey Two. Trumbull later developed a more convincing image of Saturn for his own directorial debut Silent Running. The general sequence of the showdown with HAL is different in the film from in the book. HAL's initial assertion that the AE-35 unit will fail comes in the film after an extended conversation with David Bowman about the odd and "melodramatic"