[Globe and Mail Update, 1/13/12], http://bit.ly/w0yAni

Advertising is such a visual medium - whether it's 30-second spots on TV or the image onslaught of outdoor billboards and street furniture - that blind and visually-impaired consumers are, for marketers, often invisible. But South African fast food chain Wimpy is bucking the trend with an unusual marketing campaign: a Braille Burger.