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Patrick says

Amazing optical effect

Blasphemy! No intelligent designer would create such buggy vision in creatures of his own likeness! You conjured this image using witchcraft.

Not as much of an optical illusion than a hard to see pattern design. Imagine having to wallpapper with this pattern. Or a tile pattern where every other tile had the black dot in the center.

Reminds me of looking at the two parties with their surperior illusions(delusions).

I wonder if it is more of a case of demonstrating the fact that that you really only see what you are focusing on, rather than what is in you periphera field of l vision. If there was a version where the peripheral dots were turned on/off at 1Hz, I think one would be able to notice all the dots even if ostensibly focusing on just one of them.

Good one!

Point your fingers at two adjacent black dots, and you will see both of them at the same time, but the simultaneity may be an illusion as well.