The Pepsi logo contains circle with the top half is red, the bottom half is blue, and a wavy white line runs through the center. The colours have always represented the American Flag, therefore its marketed as 'Americas Drink'
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.
This evolution of the Pepsi logo shows importance of graphic design and branding. Logos are important for corporations because thats how they identify with the cosumers. As the art form has gotten older it has become increasingly minimalist.