Your Reflection Is Not Where the Mirror Says It Is

Most people will tell you their reflection lives on the glass. Most people are wrong by a factor of two, and sometimes much more. The person looking back at you isn't at the mirror surface. They aren't near it. They're in a location so strange that no physical object could ever actually occupy it — and your brain has been hiding this from you every morning of your life. In this video, Feynman walks through the geometry of mirrors as laid out in his famous Lectures on Physics — using ray tracing, Fermat's principle, and a handful of tests you can run at home to show that the reflection you've known all your life is a ghost in a place that isn't there. Along the way: why cameras won't let you cheat, why left-right reversal is a myth, why you only need a mirror half your height to see your whole body, and why two astronauts left a mirror on the moon that only bounces light straight back. Uploaded 25-04-26 📚 SOURCES: • The Feynman Lectures on Physics, Volume I — Chapter 26: "Optics: The Principle of Least Time" (1963) • The Feynman Lectures on Physics, Volume I — Chapter 27: "Geometrical Optics" (1963) • Isaac Newton, Opticks, Book I (1704) — Law of Reflection and image formation • Euclid, Optics (c. 300 BCE) — Earliest systematic treatment of reflection • Hero of Alexandria, Catoptrics (c. 60 CE) — Shortest-path principle for reflection • NASA Apollo 11, 14, and 15 mission records — Lunar Laser Ranging Retroreflector Arrays (1969–1971) ⏱️ TIMESTAMPS: 00:00 — The mirror you've been lying to yourself about 02:15 — Why the image survives every test you've ever run on it 04:40 — Three experiments the glass cannot pass 08:10 — Where your reflection actually lives 11:30 — Euclid, Newton, and a two-thousand-year-old fix 14:20 — The left-right flip that was never a flip 17:45 — The mirror that only shows you your own eye 20:30 — When light converges to somewhere it isn't 23:10 — The reflection, the chair, and everything you see 🎬 CREDITS: Written in the voice and style of Richard Feynman Produced by Feynman Reborn Based on The Feynman Lectures on Physics, Caltech / Addison-Wesley (1963) Script consultants: geometrical optics references per sources above Narration: AI-generated synthetic voice What's your answer — can you train yourself to feel the reflection behind the glass instead of on it? ⚠️ WARNING: [This video is AI-generated (synthetic voice and visuals). It is an original, fictional lecture inspired by Richard Feynman's teaching style and public ideas, and is not an authentic recording, endorsement, or statement by Richard Feynman or his estate. Any resemblance is for educational/creative purposes] Learn more about your ad choices. Visit megaphone.fm/adchoices