Double Ring Illusion (Demo 2/3)

Bai, D., & Strickland, B. The "double ring illusion": The physical constraint of solidity shapes visual processing. Journal of Experimental Psychology: General. Advance online publication. https://doi.org/10.1037/xge0001839

Explanation
Here, strikingly, most observers see the rings move in 180° co-rotations (and rarely, if ever, 360° co-rotations). In reality, the rings move in the same way as before.

This suggests that the visual system 'knows' that objects cannot pass through each other (i.e. 'solidity' constraint), thus 'forcing' you to predominantly see the motion that respects solidity (180° co-rotation), rather than the motion that violates it (360° co-rotation)!


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Separated Overlapping Gapped
Download this demo (.mp4)
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