In black you can read the word GOOD, in white the word EVIL (inside each black letter is a white letter). Now, what do you see?
You may not see it at first, but the white spaces read the word optical, the blue landscape reads the word illusion. Look again! Can you see why this painting is called an optical illusion?
What do you in the one below?
This one is quite tricky!
The word TEACH reflects as LEARN.