Look at urban photos from the turn of the past century, and you are likely to see painted wall advertising. Before television, billboards, illumination and other manufacturing techniques became popular, the wall was the dominant advertising medium. The past few decades have seen a resurgence of the hand painted mural. Large format is the key: some murals can cover hundreds of square feet. For most businesses, a mural is an investment that pays for itself for years to come. Others, in premium downtown wall areas, can be up for only a few months, and still be a huge bargain in terms of visual impact and brand recognition.