How do the ‘shake your phone gently’ images actually work?

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How do the ‘shake your phone gently’ images actually work?

In: Other

It’s not known for sure but the most likely explanation is that the area that seems to move is quite different in color from the area that doesn’t and the rods and cones in your eyes take slightly different amounts of time to send signals to your brain.

https://pubmed.ncbi.nlm.nih.gov/12854649/

Info: can you show me an example?