The Fraser spiral illusion reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Fraser spiral illusion

The Fraser spiral illusion is the famous spiral after-effect illusion based on the "motion after-effect" illusion. This was first described as the Waterfall Effect by 19th Century theorist R Addams. This was later studied in the 1970s by Robert Sekular and Eugene Levinson, who called it "perception of moving targets".

See also, Optical illusion

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