Concentric circles, not a spiral

If that’s a polite way of saying I’m old, then yeah.

Incidentally, when I see the circles, the whole thing goes 3-D and the circles are the foreground, hovering above the background. Seriously, I just relax my eyeballs a little and the circles jump right out. (I don’t normally have this reaction to optical illusion type stuff, apparently just this one.)

Edit: Whoa! I get the reaction you described from @MarkDow 's edited version. That is hard to see, and painful! Aargh!

I can make out the circles by tracking my eyes in a circular motion, but darn that’s unpleasant.

Points for identifying the pattern as something our eyes like to warn us against turning our eyeballs or head quickly to track. Off to the the POV ball licensing (and safety equipment) authority to make beach volleyball more kinetic, then. [Over to the 240kg and up concourse, PoiPoi sportscaster Cameryon! UK viewers may wish to deselect record, but enter the captcha shown to win a prize!]

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