something strange with the main post image?

What you actually see there is a variation of Hermann’s grid, which I generated with the help of Gemini. And to be exact, I based it on the different modifications of this grid created by Jacques Ninio. The classic Hermann Grid creates illusory grey spots at intersections because retinal cells misinterpret the brightness of peripheral stimuli. Jacques Ninio’s variations magnify how ‘easy’ it is to manipulate perception by visual grouping and using focus [1].

Returning to the opening question, if the answer is positive, then perhaps you would be interested to know that you were deceived by a powerful optical illusion known as the scintillating grid illusion. As you glance at the grid, you will likely see dark, phantom-like ‘ghost’ dot…

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