Conan the Librarian was allowed to take a bunch of textbooks my HS was going to toss, and he carved them into the City of Knowledge - stacks of textbooks cut and carved and glued to look like skyscrapers, complete with some relevant clues hidden in the cuts. The main city park / battle site was...
made from the covers of two specific kinds of textbook, and the main obelisk that we impaled a god on was made out of a three-part sheath that went from regular to partially destroyed to "oh geez is that a Stretch Armstrong painted up and impaled?"
There was that one that was essentially the inside of a cube for the representation of a players mental space. Players coukd traverse it like it was a flat surface but we're effectively on walls and upside down. It really allows for some interesting physics and opened up how they had to think
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Killing Ares was super fun (AD&D time travelers)
Also, this made me go back and send a message to another teacher, Ms Harkins (Math) and thank her for everything (and brag about my math whiz kids)
And yay for math nerds!