Do you understand this billboard? If not, that’s the whole point
Cryptically-worded billboards, such as this one in San Francisco's Mission District, have been springing up all over the city in the past year or two. They are intended to be understood only by a small audience. Chloe Veltman/NPR hide caption toggle caption Chloe Veltman/NPR Billboards in San Francisco used to be easy to understand, whether