 Tree shaping has been practiced for at least several hundred years, as demonstrated by the living root bridges built and maintained by the Khasi people of India.Crop circles are created by crop artists plan in advance on paper, and often work with farmers, special equipment, and a diversity of crops to create multi-acre masterpieces that are viewed from the air and are captured via photographs.They draw on a variety of impressionist, surrealist, and modernist roots in their designs, and some are downright quirky