A guidebook to the unnoticed yet essential elements of our cities, from the creators of the 99% 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 baked into the buildings we inhabit, the streets we drive, and the sidewalks we traverse. Roman Mars and coauthor Kurt Kohlstedt zoom in on the various elements that make our cities work, exploring the origins and other fascinating stories behind everything from power grids and fire escapes to drinking fountains and street signs.