A beautifully designed guidebook to the unnoticed yet essential elements of our cities, from the creators of the wildly popular99% Invisible podcast Have you ever wondered what those bright, squiggly graffiti marks on the sidewalk mean? Or stopped to consider why you don't see metal fire escapes on new buildings? Or pondered the story behind those dancing inflatable figures in car dealerships?99% Invisible is a big-ideas podcast about small-seeming things, revealing stories b