I did an experiment once where I made my computer background a similar image that produced the same undulating movement illusion, to see if I would lose sensitivity to it over time. Not only did I not desensitize, I think I actually became more sensitive to it with time, and I would get flashes of that sensation looking at grass and trees and shit. Still do every once in a rare while, it’s kind of similar to the phenomenon where you think you see someone you recognize, but at a second glance they are obviously a stranger. I’ll just get the occasional random “movement detected” sense from a pattern in woodgrain or raindrops on a windshield, but when I look back at it I usually can’t see it again. It’s an odd feeling.