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Tree shaping, known under a variety of names, is the art and technique of growing and shaping trunks, branches and roots of trees and other woody plants. By grafting, shaping, and pruning the woody trunks, or guiding branches, trees are made to grow into ornamental or useful shapes. Tree shaping is similar to espalier, bonsai and sometimes includes some topiary.
From BuzzFeed's 50 Jaw-Dropping Examples Of Street Art From Around The World
People standing on top of flawlessly pruned trees - Lost At E Minor: For creative people