@AkiyoshiKitaoka Is this effect documented? For once a perceptual effect I can actually see 
https://twitter.com/RichardWiseman/status/1233355433647181825 …
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Mesmerizing!... at first both cubes are turning in the direction toward each other (from a downward view) ... and after staring at them for awhile, the cubes look to be turning the opposite way (and from an upward view.)
!Thanks. Twitter will use this to make your timeline better. UndoUndo
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