Quebec City Magic Festival Creates Stunning Invisible Posters

The agency lg2 teamed up with the Quebéc City Magic Festival to create a rather crafty way of promoting the event. A fair amount of posters were placed around cities, featuring only a white background, a black top hat and a small text below it asking the passerby to take a photo of the poster with flash, revealing a secret message – and of course, the secret message is the festival itself.
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Via: Creative Guerrilla Marketing