We now live in an era when gonzo viral marketing runs the risk of being more intriguing than the film it's designed to promote. In Paris, the Saint-Martin stop (which has been unused for 73 years) on the Metro's Line 9 was transformed into the extraterrestrial architecture of Prometheus, giving passengers a glimpse of Gigeresque Hell on their daily commute. I hope this set sticks around for years, an artifact of film promotions past, sort of like the Space Jam website.
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Couldn't hurt to have some facehuggers flying at the carriges...