![](http://img87.imageshack.us/img87/3433/15oo.png)
In black you can read the word GOOD, in white the word EVIL (inside each black letter is a white letter). It visualises the concept that good can't exist whithout evil (or the absence of good is evil ).
![](http://img520.imageshack.us/img520/6430/26vm.png)
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.
![](http://img92.imageshack.us/img92/411/36jt.png)
The word TEACH reflects as LEARN.
![](http://img525.imageshack.us/img525/5769/47gp.png)
In brown you can read ME, and when you look through you can read YOU.