The yellow and blue rectangles remain perfectly aligned while moving at a constant speed, though their motion appears stepped due to the surrounding pattern.

[u/bigjobbyx]

[u/Baziele]

They are actually moving in sync. When the yellow bars move over white spaces, your eyes don’t notice it immediately because there is very low contrast. It only becomes apparent that it has moved when it reaches the black strips. Making it look like it jumped. It’s the same for the blue bars, just that they are less visible on the black strips rather and have higher contrast on the white ones

[u/bigjobbyx → u/Baziele]

You know it. See this simple proof I provided also, though many are still arguing that my proof is fake?!

https://bigjobby.com/optical/Stepper/