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Hermann-Hering Illusion

\begin{figure}\begin{center}\BoxedEPSF{HermannHeringIllusion.epsf scaled 500}\end{center}\end{figure}

The illusion in view by staring at the small black dot for a half minute or so, then switching to the white dot. The black squares appear stationary when staring at the white dot, but a fainter grid of moving squares also appears to be present.

© 1996-9 Eric W. Weisstein