Tree houses truly come in all shapes and sizes. But a spherical tree house -- is that even possible? Where there's a will, there is a way, but it takes a truly free spirit to develop a series of spherical tree houses in the forest of Vancouver Island. Enter Tom Chudleigh, the designer of the Free Spirit Spheres. Chudleigh builds his bubble-shaped tree houses using a 10.5-foot (3.2-meter) fiberglass sphere that is coated with light, local wood. Each sphere features four attachment points on the top and four on the bottom, so the structure is supported by a web of support ropes and cables that help to stabilize it and prevent it from falling. You can rent one of the three eco spheres, which each feature a bed, a table and chairs, and some storage space (sorry, no bathroom), for a rate of $135 to $275 per night [source: Hanlon].