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A friend sent me the following interesting optical illusions:

In black you can read the word GOOD, in white the word EVIL (inside each black letter is a white letter). It's all very physiological too, because it visualizes the concept that good can't exist without evil (or the absence of good is evil ).

Can you see why this painting is called optical illusion ? You may not see it at first, but the yellow spaces read the word optical, the blue landscape reads the word illusion. See for yourself!

The word TEACH reflects as LEARN.

In brown you can read ME, and when you look through you can read YOU.

Optical illusions fascinate me!