When you think of graffiti do cans of spray paint come to mind? Well it's time to wake up to the changing world of graffiti artists who do more than tag their name in paint on the sides of train cars. The art of graffiti has been elevated by elusive artists like the UK's Banksy who's graffiti is a social commentary. Recently paste-ups have surfaced in Berlin over ad space in the subways. This graffiti is definitely the work of design nerds who want to expose the secrets of photoshopery in ad work, much like Dove's Campaign for Real Beauty.