You can persive this illusion in 2 ways
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To draw an optical illusion is easy but to construct an optical illusion is pretty hard, not impossible. Shigeo Fukuda did some pretty good optical illusion with real objects. I have no idea how in the world this guy did that dice illusion, possible using back the same principle like Shigeo Fukuda did, mirror.
As you look at these dice, try to determine if they are standing up, or laying flat.
It seems as if they are doing both.