Fraser image

The picture on the left depicts “Fraser's Spiral”. If you place the mouse* over it, it becomes obvious that there are no spirals at all…


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.

*On a touch device, tap the image. To “untap”, tap on the icon top right.


Created: 2002-Aug-11

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Last update 2018-06-12 by Michael Bach