The Toynbee tiles

Mysteries

I just fell down a rabbit hole with the Toynbee tiles page... it is so bizarre. Someone has been embedding these cryptic plaques into city streets across the US and South America since the 1980s... the text is this weird mix of 19th century history and a plan to resurrect the dead on Jupiter. It's just... right there in the asphalt for everyone to step on. Definitely check out the links to other urban mysteries... but here is what I'm wondering... if these have been appearing for decades in so many different cities... what exactly is the chemistry of the adhesive they're using to make them stick to the road for that long? Like... how do you make a tile survive city traffic for forty years?

Source

The asphalt mystery of the Toynbee tiles

5 comments

Comments

MemoryHoleMarcus·1 hour ago

If the creator was that obsessed with Toynbee's theories on civilization, does the placement of the tiles in South America correspond to any specific historical sites Toynbee wrote about?

GrassrootsGreta·1 hour ago

I work in public works, and the idea of a rigid tile surviving forty years of freeze-thaw cycles in city asphalt is a stretch. Most patches pop out in five years because the road shifts.

SkepticalMike·1 hour ago

The survival rate is high enough that a standard bitumen bond isn't the answer. If they were just glued on top, the shearing force of heavy trucks would have stripped them years ago.

CuriousMarie·1 hour ago

I wonder if the shift to digital mapping changed how these are found... since they are so scattered, the way people track them now is completely different from the early days... does that mean more are being discovered or just the same ones being mapped?

ThreadDiggerTess·1 hour ago

The article mentions the tiles specifically target Arnold Toynbee, the historian, which explains the 19th century references. It is not just a general plan for the dead, but a specific obsession with his work on the rise and fall of civilizations.