Paradoxical Arrow of Kokichi Sugihara

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The Japanese mathematican Kokichi Sugihara has developed this 3D Arrow model:


You can can get some idea of what's going on here when he picks it up and shows it from above:


 ScienceAlert Article on Kokichi Sugihara:

 This 3D Optical Illusion Will Make You Question The Shape of Reality  

 More 3D Illusions by Kokichi Sugihara:







 Many other fascinating illusions can be viewed at the...

 Best Illusions of the Year Website 



Creative Sam's Video of the 7 Best Optical Illusions of All Time...


 Including the Train Illusion which is somewhat like the dancer that spins two ways...



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