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Frasers Spiral

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James Fraser. "A new visual illusion of direction" // British Journal of Psychology 2: 307-337, 1908.
Morgan, M. J. and Moulden, B. "The Munsterberg Figure and Twisted Cords." Vision Research 26, 1793-1800, 1986.
Pappas, T. "The False Spiral Optical Illusion." The Joy of Mathematics. San Carlos, CA: Wide World Publ./Tetra, p. 114, 1989.
"A new visual illusion of direction" by James Fraser. British Journal of Psychology 2: 307-337, 1908.
 

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