This set of pictures was submitted both by Bradley Melton and user called Alfonso. Jump inside this article for full set. Bradley also posted explnations. I know I spoilt you with cool real world illusions, but here and then I have to post true classics. Hope you like them! Here we go:
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 ).