Remember that computer game Myst? It took up countless hours of our junior high lives... And when we spotted this image of sustainable tree houses from Benoit Fray and Dans Mon Arbre, we were immediately plunged back into that otherworld...
Local wood makes these unique houses (or campsites) feasible in areas where the wood can be sustainably harvested; power for these yet-to-be-built tree homes will come from renewable resources.
For more impressive images and explanation, check out EcoFriend.
(Image: Dans Mon Arbre)