Apparently, there are these things called cellars. Being a California guy, I'm not quite sure what they are, but it would seem that they're ideal places to store root vegetables. Now, I am a little unclear on the concept, but I think there are regular cellars and root cellars. A regular cellar is something that comes with a house; kind of like a garage, but underneath it or something. Root cellars are ideal locations that keep a cool temperature well suited for storing certain food items. Oh, and unlike regular cellars, you can just go out and buy one.
The Groundfridge is a prefab root cellar designed by Floris Schoonderbeek for Dutch brand Weltevree. Constructed of "hand-laminated polyester," the fully contained, non-electrical food storage pod is designed to simply be installed in the ground. Given that the ground keeps a cooler temperature (even here in sunny California), the concept makes practical sense, although installing one clearly requires a little more effort than calling up your local big-box store.
After your new Groundfridge is buried (in a good way), it still offers attractive design. Shelving lines the spherical interior, providing a large area to keep foodstuffs cool in. Lighting is also provided. The pod is accessible via the built-in stairs that go down into the ground -- in terms a Californian can understand, about the depth of a backyard swimming pool.