These structures were part of an installation called Tangle Town at the Children's Museum of South Dakota. Artist Patrick Dougherty worked with more than 70 volunteers over a three week period to harvest willow saplings and construct this work of art. The structure, completed in May 2017, was the artist's first installation in the state of South Dakota. Each silo had an oculus, or circular window, at the top to give a view of the sky and to lighten the snow load in the winter. Some of the silos have been relocated to the Dakota Nature Park, where they can age and decompose naturally and provide a unique and visually striking habitat for animal dwellers of the park.