While wood is a common sculpting material, Patrick Dougherty uses it with a completely unconventional approach. For over 30 years, Dougherty has been been creating nest-like public art installations from tree saplings that keep the materials in their raw form instead of carving into them to create something new. As if woven by an enormous bird or squirrel, Dougherty's installations mesh with their surroundings. The artist mostly works in outdoor settings, endowing parks and gardens with a spark of the surreal. His installations often join existing trees and architecture, adding a sculptural dimension to the surrounding flora. Take a look at some of his installations from 1990 to today after the jump.