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  • Posted by TM Lutas on August 24th, 2019 (All posts by )

    Sometimes your eyes can trick you.

    HT: Political Calculations


    7 Responses to “”

    1. david drake Says:

      Watched that clip about 8 times trying not to see the optical illusion. Didn’t work. Is it the slight difference in lighting perceived by the eye that allows the brain interpreting the two ends appearing shaped differently?

    2. MCS Says:

      The part that I can almost understand is that it is shaped like a propeller. The viewpoint is chosen so that our line of sight is nearly parallel to the left side and more perpendicular to the right side. The facets you can see seem to produce the effect in reverse. It’s interesting that the effect holds up in the mirror, I wonder how far you could raise and lower the viewpoint before it broke down.

    3. Grurray Says:

      This reminds me of the this is true/truth meme. A play on the Platonic shadows on the cave wall.

    4. Assistant Village Idiot Says:

      The facets are the key, as this would work with various light arrangements. Facets hide or expose parts of the figure behind them. They are tilted differently.

      Part of this is our brain interpreting, of course. Our brains learn what arrangements of reflected light usually mean – and by usually, I mean over 99% – and so we automatically respond that’s what it “is.” Because it works, and it kept us from getting eaten by tigers back in the day. But everything is shortcuts in the brain, including sight, so sometimes there are ambiguities.

      If you study perception, you will find it fascinating but frustrating. I gave it up as a topic to pursue after the 20th time of thinking I finally understood it, only to learn I really hadn’t. The military has really wild information on this as they try to make things disappear from detection.

    5. OBloodyHell Says:

      Not an optical illusion, but an exercise in maximum frustration….

    6. OBloodyHell Says:


      You might find this of interest, if you did not already know of it.

      The idea isn’t so much to hide but to make rangefinding and distance/speed estimation difficult.

    7. Grurray Says:

      A great book from last year that covers the history of optics in warfare including camouflage is The Eye of War: Military Perception from the Telescope to the Drone.

      Surveillance and imaging and targeting are now so good at creating the so-called non-permissive battlespace, that fighting on open terrain is at a stalemate. It pushed war into the shadows, tunnels, alleys, sniper nests, IED potholes, etc. one end, and into swarms of ‘little green men’, drones, bots, and cyber-viruses on the other end.