Outside the USA Pavilion, a giant stylized American flag promises "American Food 2.0," and instantly delivers on that nourishing pledge with the 7,200-square-foot Vertical Farm. Figuratively inspired by the "amber waves of grain" exalted in the song "America the Beautiful," the world's largest vertical farm lines the pavilion's east facade, running nearly the length of a football field. Planted in the partition, which resembles a farmer's field tilted 90 degrees, are 42 types of vegetables, grains, herbs, and fruits, ranging from wheat, mint, and strawberries to Merlot lettuce. The plants are rooted in 1,494 ZipGrow hydroponic modules made of recycled plastic, which move outward during the day to supply the plants with the maximum amount of sunshine, while simultaneously tempering the amount of light that passes into the building behind them. Measuring 4.3 feet high, the ZipGrow modules are hung on a series of movable frames, and watered via a drip-irrigation system. "This element succeeds in so many ways," said one judge. "It adds a kinetic lure to the pavilion, it reinforces the expo theme, and it showcases a possible solution to global hunger.