Extinguishing ladybugs illusionpic.twitter.com/xt5ThFy0zS
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When observers see ladybugs on one circle, they do not see ladybugs on the other circle.
I think that it is a phenomenon that high-contrast edges or lines mask or prevent the perception of low-contrast ones. For example,pic.twitter.com/D1K8kVGwZe
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