The plan behind the scenes was to create an intriguing visual signature. To serve the subtleties of the script and to help personify death, production designer John Willet developed the concept of "skewing" the sets. "What I've tried to do with the sets themselves, with their design and with various color choices, is to make things just a little unnatural," Willet explained. "Nothing that calls attention to itself, but instead creates a sense of uneasiness—the unsettling feeling that something's not quite right". To achieve this mystique, Willet designed two versions of virtually every set—one version was used before the crash and the other sets were used for scenes after the jet explodes.