Any topic is good. Don’t care about format or where it’s published as long as I can access it (substack, random PDF, journal, etc). Looking for deep and rare thought, but essay length for a short reading.
EDIT: Also I am particularly looking for stuff not as much in online or nerd culture.
The best weird ideas are framed as hard science fiction.
Here are 3 good ones
Fine Structure by qntm ( https://qntm.org/structure . Free)
Friendship is Optimal by Iceman ( https://www.fimfiction.net/story/62074/friendship-is-optimal . Free)
Axiomatic by Greg Egan (it’s a collection of short stories. Nonfree. Google it)