From Maine to New Mexico and from Alabama to Minnesota a series of roadside poetry signs have been popping up across the United States. The often philosophical works are all based on Japanese Senryū  style a sister poem to the Haiku. While traditional Haiku are about nature, Senryū follow the same 5-7-5 syllable format to address elements of human nature. You can discover more about the secretive project at Roadside Senryū.