Rotation Generated by Translation

2013 First prize
Jun Ono, Akiyasu Tomoeda and Kokichi Sugihara
Meiji University and CREST, Japan

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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