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A "barber's pole" with a helical stripe is a familiar sight, and is used as a secondary metaphor to describe objects in many other contexts. For example, if the shaft or tower of a lighthouse has been painted with a helical stripe as a daymark, the lighthouse could be described as having been painted in "barber's pole" colors.
Barbers have been cutting hair for centuries, but they used to have a longer job description. In medieval times, the professionals were known as barber-surgeons, which is just what it sounds like.
The theory behind the illusion was demonstrated during an episode of the BBC's show Bang Goes the Theory, where the effect was described as "a musical barber's pole". [ 2 ] The scale as described, with discrete steps between each tone, is known as the discrete Shepard scale .
The barber's pole is commonly found outside barber shops. In 1929, psychologist J.P. Guilford informally noted a paradox in the perceived motion of stripes on a rotating barber pole. The barber pole turns in place on its vertical axis, but the stripes appear to move upwards rather than turning with the pole. [3]
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