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"Anyone who reads TreeHugger knows we love treehouses, so here are a few more to add to our obsession. Casa na Arvore, is a Brazilian firm that has been building fabulous spaces in trees since 2003, and on the following pages, you'll see the best of their "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/slideshows/sustainable-product-design/spectacular-brazilian-treehouses-by-casa-na-arvore/>