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mk  ·  4580 days ago  ·  link  ·    ·  parent  ·  post: Ask hubski: how does this optical illusion work?
It would be a sick joke if this was an animated gif.

What I don't understand is why the top two turn outwards, while the bottom two turn in... the maddening thing is that I turned my screen 90 cw and the directions didn't change!