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Very good question! Mostly for self-reflexion though.
Allegory of the Cave, by Plato messed me up for a while. Coming to my own beliefs and the realization thereof. Almost anything involving pi/infinity/e/i/etc simply because I believe the universe is based on math and science and I see how they all related.
I wouldn't consider many things I've done really world-shaking, probably out of a self-defense-mechanism.
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