Fraser's Spiral

 

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The picture depicts “Fraser’s Spiral”. But if you place the mouse over it, it becomes obvious that there are no spirals…

 

Sources.

 

Fraser J (1908) A New Visual Illusion of Direction. Brit J Psych 2:307–320

Morgan MJ, Moulden B (1986) The Münsterberg figure and twisted cords. Vision Res 26:1793–1800

Popple AV, Sagi D (2000) A Fraser illusion without local cues? Vision Res 40:873–878

Parts of Fraser’s original paper have been made available by Hervé Varenneere.

 

 

Created: 2002-08-11

Last update: 2013-10-04