barber pole illusion
Ability to be humbugged or deceived; gullibility.
An optical illusion where, when a diagonally striped pole is rotated around its vertical axis (horizontally), it appears as though the stripes are moving in the direction of its vertical axis (downwards in the case of the animation to the right) rather than around it.
plural of Fairhurst
(zoology) Any of the Trionychoidea, a group of turtles.
実演では、斜め縞の棒を垂直軸の周りに回転させると縞がその軸に沿って動いて見えるという錯覚のため、回転している棒の斜め縞は周囲を回るのではなく垂直方向に動いているように見えました。
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