Amsterdam's Artiz Royal Zoo, has come up with an innovative way of interacting with the public and advertising the baby-boom that they are having at the zoo. They have created billboards made of stickers, which members of the public are invited to remove and stick around the city. So it is not only the zoo that is promoting, but passers-by also.
This guerrilla campaign proves that even traditional advertising can go "viral" with astonishing results, simply by members of the public taking an interest and spreading the stickers throughout the city.
View the video on Creative Criminals' website.