You can turn this upside down and still have a happy birthday.
It says ambigram and it IS an ambigram : turn this word upside down and it still reads the same.
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 filosophical too, because it visualises the concept that good can't exist whithout evil (or the absence of good is evil - take your pick).
A very astounding design. Not only because the words Harry Potter can be turned upside down, but also because the font is a bit reminiscent of the original one. They should put this on the cover of the next book.
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 !
Reads both the words BOMB and BLUFF. An ad for Veja magazine, the subject was North Korea.
Shows both the words HEAL and SIN. This was an ad for Veja Magazine, the subject was stem cells.
You can read the word SUICIDE in black, and the words RIGHT TO DIE in yellow. The subject for this Veja magazine advertisement was euthanasia.
Shows the words VICTORY and DEFEAT. A Veja magazine ad, with the reelection of Bush as subject.