The Hermann grid illusion is an optical illusion reported by Ludimar Hermann in 1870. The illusion is characterized by "ghostlike" grey blobs perceived at the intersections of a white (or light-colored) grid on a black background. The grey blobs disappear when looking directly at an intersection.
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Famous quotes containing the word illusion:
“I hadn’t an illusion in my handbag
About the people being better there
Than those I left behind. I thought they weren’t.
I thought they couldn’t be. And yet they were.”
—Robert Frost (1874–1963)
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