Salt Lake City, Utah. Newer tiles have been embedded on several major highways in Pennsylvania, including Interstate 476 in Delaware County, and on Interstate 95. About six more were found on U.S. 1 northbound starting in Drexel Hill in Delaware County, Pennsylvania in 2007 and 2008. The plates are much larger than the originals and have red italic writing on them. In 2016, some tiles started re-appearing in Philadelphia. Interpretations People and things referred to In a documentary film about the tiles, Justin Duerr assumes that "Toynbee" refers to the 20th century British historian Arnold J. Toynbee, and that "Kubrick's 2001" is a reference to the 1968 film 2001: A Space Odyssey, a film co-written and directed by filmmaker Stanley Kubrick, about a crewed mission to Jupiter. The former speculation site toynbee.net theorized that 'Toynbee' referred to Ray Bradbury's short story "The Toynbee Convector". The majority of tiles contain text similar to that above, although a second set is often found nearby. Several of these allude to a mass conspiracy between the press (including newspaper magnate John S. Knight of Knight-Ridder), the U.S. government, the USSR (including tiles seemingly made years after the Soviet Union's dissolution), and "hellion Jews". A tile that used to be located in Santiago de Chile mentions a street address: 2624 S. 7th Philadelphia, Pennsylvania. In 2006, the occupants of the house stated that they knew nothing about the tiles and were annoyed by people who asked, despite the fact that the house was the former residence of a named recluse and alleged tile-maker, as shown in the 2011 documentary film Resurrect Dead: The Mystery of the Toynbee Tiles. Toynbee-tile enthusiasts believe that a native Philadelphian created the Toynbee tiles because of the large number that appear in the city, their apparent age, the variety of carving styles, the presence of the "tile creator's screed," and the Philadelphia address on the Santiago tile. Possible subjects Arnold J. Toynbee's "The Idea" According to letters written by the tiler, allegedly uncovered by Toynbee tile researchers in Philadelphia in 2006, "Toynbee's idea" stems from a passage in Arnold Toynbee's book Experiences: Ray Bradbury's "The Toynbee Convector" Another possible interpretation is that the Toynbee reference comes from the science fiction writer Ray Bradbury's short story "The Toynbee Convector," which alludes to Toynbee's idea that in order to survive, humankind must always rush to meet the future and believe in a