Let’s just resort to examining walking which is pretty complex in its own. Imagine a human crossing your way (just in 2D). You’ll notice different displays of the body. Left foot in front, right hand in front while the oposite limbs are behind. This slowly changes so the left foot remains behind while the right progresses along with the body. But at one point the cycle repeats. If you don’t close your eyes you see the person progressing smoothly. If you close your eyes and keep them closed for a bit and open them again the person