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 ).
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?
This one is quite tricky!
The word TEACH reflects as LEARN.
You probably read the word ME in brown, but.......
when you look through ME
you will see YOU!