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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“There can be no greater error than to expect, or calculate, upon real favors from nation to nation. It is an illusion which experience must cure, which a just pride ought to discard.”
—George Washington (1732–1799)
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