Imagine yourself in a city. It could be any major city on the east coast in the western hemisphere. For nearly thirty years, its most well-traveled streets have been subject to a means of covert communication. A kind of graffiti-like tile of mysterious origin. A strange message embedded in a strange type of tile. A kind of tile that far outlasts reasonable expectations about how long a tile in the street of a major city ought to last. Laid down at the intersection of a state of fantastic sci-fi paranoia and rock-hard reality. This... is the Toynbee Idea.