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Scintillating Grid

In the figure above, dark spots appear to blink at the intersections even though they are all solid yellow.

ReferenceReferences

[1] M. Schrauf, B. Lingelbach, E. Lingelbach, and E. R. Wist, "The Hermann grid and the scintillation effect," in Perception, vol. 24, suppl. A, pp. 88–89, 1995.
[2] M. Schrauf, B. Lingelbach, and E. R. Wist, "The scintillating grid illusion", in Vision Research, vol. 37, pp. 1033-1038, 1997.
[3] R. VanRullen and T. Dong, "Attention and scintillation", in Vision Research, vol. 43, pp. 2191-2196, 2003.