This is not a gif. It is a still picture.

Hahaha

@OlderSometimesWiser Wow.

@OlderSometimesWiser I have looked at these images on screens of three different sizes: my phone, my laptop, and the monitor I can hook up my laptop to.

I find that the illusion you posted works best for me on the smallest screen, but the one I posted works best for me on the largest screen.

@Piper Wow. I have a hard time getting it to not move! You must have great will power and be impervious to suggestion! 🫥

@DrWatson Well now, today I saw it move it a little!

@Piper Congratulations! I can only see it move when my laptop is hooked up to a monitor with a fairly wide screen. On my laptop screen and on my phone, nothing happens.

@Monday40 People are having different reactions. For me, the size of the screen makes a big difference.

@Quimliqer I am now looking at it on my phone for the first time. Nothing happens. But when I look at it on my laptop, the ball and central column rotate in opposite directions and the background also appears to be moving.