Recently, legend became reality when a 10-story building in SoHo was being converted to a luxury condo. Unearthed in the walls was a large mural created by graffiti pioneers Fab Five Freddy and Futura 2000.The artwork contains a variety of images and writing executed in spray paint, grease pencil, magic marker and whatever else was on hand — in silver, gold, pink and red. There are cartoonlike pictures of a bomber airplane, images of a......