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18 of the world's most stunning treehouses

March 18, 2011, 1:25 p.m.
Free Spirit Spheres treehouse

Photo: Tom Chudleigh/Free Spirit Spheres

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Free Spirit Spheres

These spheres were created with the concept of “oneness” in mind, so the floor, walls and ceiling create one continuous space unlike a conventional building. They utilize biomimicry and are designed to fit into a forest setting without altering it. Free Spirit Spheres use trees as their foundation, which the designers say reflects our connectedness to nature, and because they’re suspended in the air, the human footprint is drastically reduced. The shell of this unique treehouse can withstand impacts, and the web of ropes that suspend it are made of a stretchy material that allow both the sphere and the trees to move freely.