Toynbee Tiles are tiles embedded in asphalt in various cities (apparently around the Western Hemisphere) that usually say:
TOYNBEE IDEA IN KUBRICK'S 2001 RESSURECT DEAD ON PLANET JUPITER
The Toynbee that is most likely referenced in the tile is Arnold J. Toynbee, a historian, who believed that civilizations rise, and then fall as a natural cause of history. (It could be also dissonance or entropy as the result of a civilization being a closed system) This would most likely be the "Toynbee Idea" referenced in the tile.
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