Dinotopia and impossible architecture
So I was reading a great fanfic involving a T-Rex with a Hollywood career after Dinotopia's discovery in the 1990s giving a TED talk (highly recommend it, it's got some great social commentary on race in the form of bigotry against T-rexes)
An Archive of Our Own, a project of the Organization for Transformative Works
Thing is...If the island were discovered, that means that the world community of physicists and mathematicians would probably become aware of this little gem, tucked away in "Journey To Chandara":
It's a goddamn Escher staircase*. And this wasn't put in by mistake, as the book actually outright says that Chandaran scholars enjoy using the stairs for long intellectual conversations, so they can be walking and talking with a friend and never run out of steps before the conversation is over.
I can just see some Chandaran scholar showing it to a visiting college physics professor, who accepted the invitation because he thought he was gonna bring modern physics knowledge to a bunch of people still stuck in Isaac Newton's time, but then sees this Safe-class SCP of a staircase and suddenly finds himself questioning everything he thought he knew about physics.
*This is what I mean:
("Ascending And Descending", M.C. Escher, 1960. Lithograph.)