The Guardian: #VoiceYourView
The illustrations show opposing viewpoints for different debates. Each picture represents one side of an issue, and when flipped it displays the opposite view. The work will appear at key locations in New York, Chicago, Los Angeles, and San Francisco as outdoor ads and mobile billboards.
People are encouraged to take a photo of the side they support and upload it to Instagram or Twitter using the hashtag #VoiceYourView. They also launched a microsite that shows the submissions, tracks votes on the different issues, and features Guardian articles about them to introduce readers to open journalism and the Guardian as a whole. Brilliant.