Abstract
IT has been known for a long time that colours can be seen if a disk bearing a suitable black and white pattern is rotated at certain speeds. This was first observed by Fechner1 in 1838, but is more often demonstrated in the form of a top designed by Benham2 (Fig. 1a), which when spun produces rings of different colours. The effect has been studied in some detail3, but it has remained a rather isolated phenomenon ignored by most theories of vision.
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