Photo: Courtesy Casa na Arvore.
If you're a regular at TreeHugger, you probably know our love for treehouses: they usually have a great use of space, connect us with nature,open up ground space, and -- let's face it -- they're a lot of fun. We've already seen crazy designs from German firm Baumraum and seriously cool ones from several other architects, including the impossibly cool Swedish mirrored treehouse concept. Now we present the fabulous designs from Brazilian firm Casa na Arvore. Take a look -- and die with envy for those who live here.