Too often, the phrase is a figurative one.
Green Magic Homes, though, has found a way to make the representational actual, with their subterranean home kits.
The company sells pre-fabricated kits for domical homes, ranging from the 400-square-foot Waikiki to the 1,900-square-foot Mediterraneo. They can go just about anywhere — even hurricane-prone areas — provided that your location is high-enough-up that it's not subject to flooding.
Uncovered, your average Green Magic Home looks like a rounded storage unit. Not exactly Pritzker Prize material.
But they are designed to be covered in a thick layer of vegetation to camouflage (and also heat-regulate and damp-proof) the home underneath. GMH says basically anything goes, from a tree (with non-invasive roots) to actual crops.
We're sure most people are happy with ivy, or grass. But that's your call.
Speaking of: if the Waikiki, the Mediterraneo or the other existing plans don't match up to your lifestyle requirements, you're free to design your own — they'll modify things to fit your specs.
Assembly takes a matter of days.
Growing the roof, well, that depends on the greenness of your thumb, Señor Chavez.