Does it move for you?
I’ve posted a couple of items like this before. It’s a static image that is supposed to appear to move in some sort of swirly fashion when you look at it. All it does for me is give me a headache. Does it move for you?
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In the Dark 
May 20, 2019 at 2:41 pm
Not when I look directly at it. But if it’s just at the edges of my vision (e.g. when reading your actual text) it swirls a bit.
May 20, 2019 at 2:46 pm
Same as Steve. Swirls for my peripheral vision.
May 20, 2019 at 5:04 pm
I just noticed that if I scroll down a bit, so that the top third is covered, it does seem to be trying to rotate clockwise. The full image just seems a bit jittery.
May 21, 2019 at 2:31 pm
Oh! On my big monitor screen it does rotate…
May 23, 2019 at 8:37 pm
Same kind of observation https://twitter.com/bardot_cedric/status/1110912741806612481
with this image: https://twitter.com/JossBlandHawtho/status/1110655606552039424.
A personal attentional bias make me call this optical illusion “mimetic dynamics”. I wonder if this could be an illustration of our brain working on making up a global “coherent” picture while agregating local patches with complex visual patterns…
May 22, 2019 at 10:23 am
Like quantum thing. It’s movement depends on how we observe it:P
May 23, 2019 at 10:20 pm
… or like mimetic matter where the scale factor in general relativity is isolated in a covariant way where it can be traded for a scalar field representing the time coordinate! This innocent looking modification can have drastic consequences on cosmology: in particular, geometric invariants of this scalar field are claimed to mimic dark matter without the need for new particles https://link.springer.com/article/10.1007%2FJHEP11%282013%29135.
Interestingly this mimetic field may be a consequence of the volume quantization of compact three dimensional foliations of space-time. https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.114.091302 (disclaimer: mimetic gravity has been studied mostly in the context of cosmology and black holes up to now and its authors don’t claim to model galaxy rotation curves with mimetic gravity)