Which major design change did Pepsi make to its logo and packaging in 2008 that was reportedly accompanied by a 27-page design document explaining its relationship to the universe?

Product packaging can become just as iconic as the product itself, especially in the world of pop culture. Some packaging designs have remained relatively unchanged for decades, becoming symbols instantly recognized worldwide. The 'Cola Wars' between major soda brands have given us some of the most recognizable packaging in retail history. Test your knowledge of these iconic designs that have shaped pop culture and consumer behavior!

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They tilted the circular logo to resemble a smile, claiming it represented the 'gravitational pull of Pepsi's new brand identity'
They added a golden ratio spiral to the logo, claiming it represented 'perfect harmony with consumer psychology'
They incorporated a hidden arrow in the logo, claiming it represented 'forward momentum in the beverage marketplace'
They changed the font to a proprietary typeface called 'PepsiSans', claiming it was 'scientifically proven to increase thirst response'