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, beca use it visualize the concept that good can't exist without evil (or the absence of good is evil).
This anti pepsi ad is a great example of semantic memory. You automatically know that this is the pepsi logo because of brand awareness. This shows that soft drinks such as this can make you fat so you must be careful what you put into your body.