Thought this would be right up Disinfo’s alley. Via Cracked:
‘The Toynbee Tiles are cryptic messages found embedded in asphalt in various cities. The messages are thought to be layers of linoleum and asphalt crack-filling compound, and all tiles are found with variations of the same short message, referencing 2001: A Space Odyssey and suggesting we resurrect the dead on planet Jupiter.
Other than that, the only things setting these abnormally permanent acts of vandalism apart: They’ve been showing up out of nowhere, with no explanation for 30 damned years.’
You can see the word “Toynbee” at the top, which is referring to a famous historian. And if you’ve seen 2001 you know that the planet Jupiter is involved. And… that’s as much sense as we can make of it…
[more at Cracked]
Large and colorful Toynbee tile found in downtown Washington D.C., with closeup of its bottom tab. Taken by en:User:Erifnam in 2002 (GNU License)