A grid illusion is any kind of grid that deceives a person's vision. The two most common types of grid illusions are the Hermann grid illusion and the scintillating grid illusion.
Read more about Grid Illusion: Hermann Grid Illusion, Scintillating Grid Illusion, Differences Between The Scintillating and Hermann Grid Illusions, Theories
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“As with our colleges, so with a hundred “modern improvements”; there is an illusion about them; there is not always a positive advance. The devil goes on exacting a compound interest to the last for his early share and numerous succeeding investments in them.”
—Henry David Thoreau (1817–1862)
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