You never know what might be lurking in the dark. For Zippo, Ogilvy New York came up with a unique experience to prove it. Out-of-home usually asks people to buy something, but Zippo's Pyrotechnic Posters asked people to burn something—the advertisement itself. Holding a flame (from a Zippo, of course) to three art installations revealed stunning artistic imagery that only could have been seen by holding up a light.