Trees
Trees are the ultimate life hacks for the modern world. Not only do they provide oxygen, shade, and a nice place to hang out, but they also offer a plethora of uses for the resourceful individual.
Want to make a treehouse but don't have any building materials? Just take apart an old shed and reassemble it into a tree! It's like a giant game of Tetris, but with more splinters.
Or perhaps you're looking for a new way to get around? Just attach some wheels to a tree and you've got a mobile home on wheels. The ultimate in tree-mobility!
Treehouses and Trees on Wheels are just two of the many uses of a single tree.