This hurt my brain
@Andy_P but… how?! I guess, the mystery could be solved by measuring sizes of both disks, frame by frame. or just by erasing arrows. %)
@fuzzylynx I’m not on a pc to check frame-by-frame but I suspect the thin inner and outer rings around the big colorful ones are probably changing somehow to cause the effect.
Because the illusion still works if you cover the arrows, so it’s more than mere suggestion
@lbehm @miklo @Andy_P so, after eliminating of almost all possible causes, it’s safe to suppose that the illusion is caused by those thin rings. and I guess it’s their brightness (much more than the color) which affects our perception the most. since the background is neutral gray, gradual change in brightness of outer and inner thin rings in opposite directions gives us an illusion of moving borders of main rings.
@Andy_P I had to check with my fingers to make sure they were really moving! They are, but much more slowly than the colors are spinning, so it's not a trick, but it might be trying to pretend it is. :)
@Andy_P Any idea how it works? I’m trying to reproduce it with CSS but can’t achieve the illusion as I don’t understand it. :(
Spend an hour toying around it, failing.
@meduz You should be able to do this in CSS, see my analysis reply to my first post. Opening the frames in an editor reveals its secrets.
👍 Latéralisation, rythme et propriétés spaciales de la couleur (rouge=près bleu=loin) + petit trick sur les "bordures" en relief (accentuation).
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