Sphere house design is not new and nor is relocatable housing. We covered an ingenious design last year. The aptly-named Free Spirit Sphere offers easily relocatable housing that can sit in a cradle on the ground, or be hoisted 30 metres into the air in an old growth forest. Whatsmore, the sphere can be removed inside 24 hours leaving not a trace that it was ever there. Currently only produced in hand-crafted US$100,000 wooden versions, creator Tom Chudleigh plans to release a fibreglass version by mid-year that will sell for just US$25,000.