Film theorist Vivian Sobchack argues that science fiction films differ from fantasy films in that while science fiction film seeks to achieve our belief in the images we are viewing, fantasy film instead attempts to suspend our disbelief. The science fiction film displays the unfamiliar and alien in the context of the familiar. Despite the alien nature of the scenes and science fictional elements of the setting, the imagery of the film is related back to mankind and how we relate to our surroundings. While the sf film strives to push the boundaries of the human experience, they remain bound to the conditions and understanding of the audience and thereby contain prosaic aspects, rather than being completely alien or abstract.
Genre films such as westerns or war movies are bound to a particular area or time period. This is not true of the science fiction film. However there are several common visual elements that are evocative of the genre. These include the spacecraft or space station, alien worlds or creatures, robots, and futuristic gadgets. More subtle visual clues can appear with changes the human form through modifications in appearance, size, or behavior, or by means a known environment turned eerily alien, such as an empty city.
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