The Birth of double meaning pictures

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 visualize the concept that good can’t exist without evil (or the absence of good is evil ).

The word TEACH reflects as LEARN. 

,optical

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