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The original was posted on /r/todayilearned by /u/tyrion2024 on 2025-03-10 00:15:54+00:00.

Original Title: TIL in the mid-20th century, a researcher wore a pair of hand-engineered goggles that completely inverted his eyesight. Although he “stumbled wildly” at first, after 10 days he had grown so accustomed to his upside-down world that “paradoxically” everything began to appear rightside-up to him again.