Thanks, Ardy and Katie. I did have trouble coloring it in, because there as sooooo many sections, and I was trying not to repeat, at least not in the same shape. I also made a version where I blacked some squares and circles out, and I almost went with that, but I keep using that cop-out when the design gets too busy, so I decided to just let it be... And I didn't even notice the optical illusion until you pointed it out--groan...! :-)))
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