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A reader posted a comment with a link to the opposite illusion: https://seniorjunior.blogspot.com/2007/11/amazing-optical-illusion.html

This is what the NYT says about it:

"Does the picture you see above appear to be moving, growing or expanding? This static image, of a darkness that threatens to swallow up the viewer, has much to...

I see the black blob -- or hole -- against the magenta background expanding the fastest and the slowest against the red background.

And another one. What do you see now? Any differences?

I enjoyed Rik's illusion pics and ran into this one. What do you see?

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