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Why do these work?
The design is an optical illusion that will trick the eye into de-synchronizing the movement outside the picture and the movement inside the picture, giving the illusion that the
breasts[shitposts] are actually bouncing up and down.https://knowyourmeme.com/memes/shake-your-screen-optical-illusion
Sciencey source: https://www.ncbi.nlm.nih.gov/pubmed/12854649
This one doesn’t work for me
Try in a dimly lit room once your eyes get accustomed to darkness