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
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
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The dark purple backdrop of the booth itself can be very eye-catching, but when you add a spinning Benham Disc, a pile of newly-designed brochures, and three energetic young women, you have a combination that not many English teachers wanted to pass up.
Report from the national council of teachers of English annual convention

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