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A software rendering of a spinning barber pole Barber pole, c. 1938, North Carolina Museum of History Barber shop in Torquay, Devon, England, with red and white pole. A barber's pole is a type of sign used by barbers to signify the place or shop where they perform their craft.
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]
Those rotating red, white, and blue poles outside barbershops have become an icon. At first glance, you’d probably assume barber pole designs have a patriotic background. But the reality is ...
[21] [22] A spinning barber pole creates a visual illusion, in which the stripes appear to be traveling up or down the length of the pole, [23] rather than around it. [24] [25] In the United States, the blue stripe is also sometimes used to match the flag. [10] [26] [27] In South Korea, barber's poles are used both for actual barbershops and ...
Orientation varies with that of polarization of light source. Haidinger's brush, more commonly known as Haidinger's brushes is an image produced by the eye, an entoptic phenomenon, first described by Austrian physicist Wilhelm Karl von Haidinger in 1844. Haidinger saw it when he looked through various minerals that polarized light. [1] [2]
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