这是由纯平移产生明显旋转的。方形的图案由四个段出现旋转时，直线移动以恒定的速度在整个网格的背景。更令人惊讶的是，可以在相反的方向的旋转所产生的完全相同的方形图案。这种错觉可能被解释为知名尺蠖错觉;尺蠖错觉产生在四个分部陆续产生旋转的印象。这种错觉是新的，在这个意义上的纯平移所产生的旋转。
This illusion concerns apparent rotation generated by pure translation. Square patterns consisting of four segments appear to rotate when they move straightly at a constant speed across the grid background. More surprisingly, the rotations in opposite directions can be generated by exactly the same square patterns. This illusion might be explained by well-known inchworm illusion; inchworm illusion arises at the four segments one after another resulting in the impression of rotation. This illusion is new in the sense that the rotation is generated by pure translation.
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