sealant than older ones. Usage Deployment Toynbee-tile enthusiast Justin Duerr claims to have once found and examined a newly installed tile. This new tile was wrapped in tar paper and placed on a busy street early in the morning. From this find and other evidence, Duerr believes that the pressure exerted by automobiles driving over the tile for weeks on end pushes the tile into the road surface. Eventually, the tar paper wears away, exposing the message. A Toynbee-tile enthusiast website reported a tile found in Pittsburgh that included deployment instructions, which the reader transcribed as "linoleum, asphalt glue (?) in several layers, then placing tar paper over it so that car wheels won't mess it up, and apparently the heat of the sun on the tar paper will bake it into the street." This tile was located near the Pittsburgh Hilton and has since been paved over. Destruction, conservation, and public acknowledgment Tiles that are located in the middle of busy streets and highway on- and off-ramps tend to wear away quickly and also can become victims of resurfacing; smaller tiles and those located close to pedestrian crosswalks tend to be in better condition. Hundreds of tiles have been destroyed during the course of regular road maintenance. The city of Chicago has declared the tiles "vandalism" and removes any tiles that it finds, considering them to be "no different than graffiti." A large tile complex, the tile maker's apparent rant against his enemies, was destroyed when Chestnut Street in Philadelphia was repaved. One tile has been damaged and unreadable since 1996. It is located at the corners of Talcahuano and Santa Fé streets in Buenos Aires, Argentina. There is no public or private agency dedicated to conserving Toynbee tiles. Many tiles now exist only as photographs taken before their destruction. The tiles have enjoyed attention from American and European media outlets, including from The New York Times, The Chicago Sun-Times, Spiegel Online, and NPR. In 2011, Philadelphia-based filmmakers Justin Duerr, Jon Foy, Colin Smith, and Steve Weinik released Resurrect Dead: The Mystery of the Toynbee Tiles, an independent documentary film about the tiles. The film was selected for the 2011 Sundance Film Festival in the U.S. Documentary category, and Foy won the category's Directing Award. , the Streets Department of Philadelphia recognizes Toynbee Tiles as street art, and "will save one or two of the Toynbee Tiles only if