Optical illusion
See also: Barberpole illusion and Strange loop
A spinning barber pole is the basis for the motion perception optical illusion, in which the stripes appear to be traveling down or up the length of the pole,[12] rather than around it.[13]
As one psychological expert noted, while making a metaphor to an auditory illusion:
The counterclockwise motion of the diagonal stripes (rightward, from the normal view of the pole) moves each stripe out of view in the same way that an apparent fundamental quiets itself during its ascent, while the emergence of a new stripe resembles the rise of a new fundamental. The cylinder as a whole resembles the amplitude envelope of the ST[clarification needed] [Shepard Tone] because it does not change in height. The barber's pole appears to rise infinitely because visible portions of the stripes rise in the visual field, but the stripe at any given height is actually making a 360° rotation.[13]It is said that the applicable limits of perception are due in part to the aperture problem
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