We all know that eco-chairs are made of sustainable materials from recycled items to naturally sourced materials and more. The Upside Down chair may not be new at all when it comes to its source, as it is made from a tree trunk. What made it unique is how the trunk intentionally grown to create this eye-catching eco-chair. The Upside Down chair is made of an inverted willow tree with legs obtained by twisting and splinting the branches of the tree, thus forces it to grow with four legs. The seat and backrest were then formed according to the tree’s silhouette.