Watch one crossing of the 3D trefoil and decide whether the knot itself turns. Its shape stays fixed while a bright color current travels around the curve, creating a motion illusion that can pull the stationary form with it.
Music: "Sonatina in C Minor" by Kevin MacLeod (incompetech.com), licensed CC BY 3.0 US. Excerpt trimmed to 30 seconds and mixed with this video.
Source: https://commons.wikimedia.org/wiki/File:MacLeod,_Kevin_-_Sonatina_in_C_minor.ogg
License: https://creativecommons.org/licenses/by/3.0/us/deed.en
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