Starting from 1:33, sometimes, I feel like the sticks that holds the balls hit the ring. It's an optical illusion because I saw the animation from different views (like top-view, left, right,...etc.), but it doesn't hit the ring. Is this because of similarity in materials or colors, light and shadow, speed of animation, something else? https://www.youtube.com/watch?v=Fuqgc3QpPP0

Thank you,

  • That video caused massive halos in my vision.
    – Scott
    Aug 10 '20 at 20:47
  • I don't see any such optical illusion.
    – Billy Kerr
    Aug 11 '20 at 9:48
  • @Billy Kerr It's not a real illusion. Sometimes, I feel like they are hitting each other but this is unintentional :) Aug 11 '20 at 19:49
  • Sorry but I don't get that feeling at all.
    – Billy Kerr
    Aug 11 '20 at 19:53
  • I do. There are couple instances where it absolutely looks like the bars holding the balls collide with the C.
    – Scott
    Aug 11 '20 at 20:22

Human brain makes the a simplest plausible possible approximation of things it can not see. Now the pendulums do not move straight, but there is no other easy frame of reference to the fsct that they not move straight. So when the gap is obscured your brain assumes they did move straight which means they in your mind crashed.

This illusion is much lesser for a person who have studied motions like this since they have a wider range of plausible movements.


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