A sculpture in the ground, Kenneth Snelson's Tree 1
"Interest in atomic theory, concern with the underlying structure of the universe, and the principle of connectedness are expressed in Snelson's works. "Tree I" has been seen to represent an abstract tree of knowledge which, with its many branches, symbolizes the interrelatedness of science and the humanities" http://www.nlm.nih.gov/exhibition/tour/treei.html