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It's called the art of Pooktre, growing and shaping trees into art and furniture. It's the invention of Australian, Peter Cook.
In 1987, he had been at one of his favorite places were three large fig trees nestled under the cliff face. As he was walking home from the cliffs behind the cabin the idea came to him, “I wonder if I can grow a chair”. Telling his partner at the time about his idea, she hated the concept.
The more he thought about it the more logical it seemed. Not deterred he started the very next day. He took 7 cuttings from a willow and planted them in a U shape in the area where he directed the waste water from the cabin. Source - Pooktre
Nine years later Peter joined up with Becky Northey. Located near Brisbane, Peter and Becky tend their garden, Pooktre Tree Shapers.
Pixelaneous #29: Top 10 Fantastic Art Pictures
Source - Newsday
Source - Pooktre
Death by 1000 Papercuts Front Page.