Look at this GIF.
There’s no sound, but most people who see it hear a “thudding” in their head each time the bouncing structure hits the ground.
Why? Does anyone in visual perception know why you can hear this gif? pic.twitter.com/mcT22Lzfkp— Lisa DeBruine ️ (@lisadebruine) December 2, 2017The answer has to do with how our senses work, says Christopher Fassnidge, a doctoral candidate in psychology at City University London.
This illusion is an example of synesthesia, or when the senses — like hearing and sight — get crossed in the brain, he explained in an email to The Verge.
Up to 20 percent of people could experience this phenomenaGoing through the world, at every moment we are surrounded by movements that are logically……