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2. Barberpole illusion - Wikipedia

   en.wikipedia.org/wiki/Barberpole_illusion

   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]

3. Barber's pole - Wikipedia

   en.wikipedia.org/wiki/Barber's_pole

   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.

4. List of optical illusions - Wikipedia

   en.wikipedia.org/wiki/List_of_optical_illusions

   The barber pole illusion is a visual illusion that reveals biases in the processing of visual motion in the human brain. Benham's top: When a disk that has lines or colours on it is spun, it can form arcs of colour. Beta movement: Movement that appears to occur when fixed pictures turn on and off. Bezold Effect

5. The real (and disturbing) meaning behind barber poles

   www.aol.com/article/lifestyle/2018/06/13/the...

   During the treatment, barber-surgeons would give patients poles to hold. Grasping the staff made their veins pop out a bit, making them easier to find while the barbers went all Sweeney Todd.

6. Barber pole - Wikipedia

   en.wikipedia.org/?title=Barber_pole&redirect=no

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