Dices Optical Illusion

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.
Color Optical Illusion

An optical illusion on colors, take note of the colour of background A and background B, the Grey color of both A and B appears to be different. One slightly darker than the other, or so it seems to be. Is it really different in term of tone?
The truth is, both A and B are of same color, take a look at the Grey strip that run across both the checker board boxes. Our mind is playing tricks with us.

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