From what I can tell, they are an inovative (and kind of cool-looking) take on farming that allows more arable land in a smaller space, like so: http://www.springwise.com/eco_sustainability/whirligro/
The idea is that because it is a spiral, it takes up less ground space and instead takes up space vertically. However, it is a spiral, which allows sunlight to pass through and hit all of the plants (unlike if you just set up a bunch of layers on top of one another). This website shows a cool skyscraper application of a spiral farm: http://www.treehugger.com/files/2011/04/proposed-towers-are-spiral-farms-and-container-cities.php
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