Benham’s Top Illusion

Benhams Top

Benham’s Top or Benham’s disk is named after Charles Benham, a toy maker but also an amateur scientist who contributed and published articles to the likes of Nature.  Benham’s observation with a toy top was relayed through an article in Nature in 1894 that described a visual phenomenon generated by a toy top painted like the above image.  When spun, the Fechner color effect is perceived.  Not everyone perceives the same colors…

 

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