Toynbee Tiles are tiles embedded into city streets with a odd messages on them – and they appear on hundreds of streets in dozens of cities, including here in Indianapolis, Indiana. The messages are almost all alike and contain some variation of “Toynbee Idea’s in Kubrick’s 2001 Resurrect Dead on Planet Jupiter.” The tile in Indianapolis, appears on Georgia and Meridian Streets, according to this site.
What does it mean? No one’s certain, but it apparently has something to do with a man name James Morasco who has no voice box, secret short-wave radio broadcasts, and playwright David Mamet.
Other news articles about the tiles: