Hermann Grid Illusion

Herman Grid Illusion

Perception | Visual illusions

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Ludimar Hermann

The illusion is of Ludimar Hermann, a German physiologist,
hence spelled with double "nn" at the end.
Please find, attached a pdf of an article on this.
See also Lingelbach's page

http://www.leinroden.de/304herfold.htm

Best regards,

Walter H. Ehrenstein

Leibniz Research Center
for Human Factors
University of Dortmund

Ardeystr. 67
D-44139 Dortmund
Germany