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Ong's Hat, or The Incunabula Papers, is a conspiracy theory that arose on the early internet. Combining cutting edge science, mysticism, and obvious hokum, it intrigued thousands of people who tried to find out what it all meant. Today we uncover the secrets of Ong's Hat, the man behind it, and the new art form it inadvertently birthed. Check out our showpage at slate.com/culture/decoder-ring

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