Toynbee tiles
The Toynbee tiles are messages of unknown origin found embedded in asphalt of streets in about two dozen major cities in the United States and four South American cities. They contain some variation of the following inscription: TOYNBEE IDEAIN MOViE ‘2001RESURRECT DEADON PLANET JUPiTER. The material used for making the tiles was initially unknown, but evidence has emerged that they...
