------- Click the green flag to see the illusion -------- If you check the code, you can see that the yellow and blue rectangles move at exactly the same speed but the black and white stripes interfere with how you perceive the movement. The same rectangle movement is repeated with a neutral grey background proving the speed is the same.
Research paper is here if you are interested: https://quote.ucsd.edu/anstislab/files/2012/11/2001-Footsteps-and-inchworms.pdf Another excellent review: https://journalofillusion.net/index.php/joi/article/view/5612/13464
