FASCINATING

Toynbee tiles (also called Toynbee plaques) are about 250 messages of mysterious origin found embedded in asphalt in several major cities in the United States and three South American capitals. They are generally about the size of an American license plate, but sometimes considerably larger. They contain some variation on the following inscription:

TOYNBEE IDEA
IN KUBRICK'S 2001
RESURRECT DEAD
ON PLANET JUPITER.

Some of the more elaborate tiles also feature cryptic political statements or exhort readers to create and install similar tiles of their own. The material used for making the tiles was long a mystery, but evidence has emerged that they may be primarily made of layers of linoleum and asphalt crack-filling compound.

Articles about the tiles began appearing in the mid-1990s, though references may have started to appear in the mid-1980s.