The Clemson Clay Nest was a public land art installation by Bavarian artist Nils-Udo that was constructed in the botanical gardens at Clemson University in South Carolina in 2005. The nest was built with the assistance of numerous students and other volunteers using 80 tons of pine logs harvested from the local Oconee County pine plantation and hundreds of bamboo stocks that were carefully organized into a circular structure dug in gardens rich red clay. After two years the piece was eventually dismantled and the mulched trees were used to partially fill the large hole. You can see many more of the work in these photos by Dylan Wolfe.