Benham's top

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Benham's top 

A disc, half black and half white with a number of concentric black bars on the white half which when rotated evokes a sensation of colour, called Fechner's colours or Fechner-Benham colours (Fig. B2). Syn. Benham-Fechner top.
Fig. B2 Benhams topenlarge picture
Fig. B2 Benham's top
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I found many Benham's disc patterns on the Internet.