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Kenneth Snelsons Needle Tower. Erected In 1968 Beside The Hirshhorn Museum And Sculpture Garden On The National Mall In Washington, D.c., This Tapered Framework Of Aluminum Tubes And Stainless-Steel Cables Is An Example Of A Tensegrity Structure. The Tubes Arent Connected To Each Other. Instead, Cables Thread Through The Tubes To Hold The Assemblage Together In Perfect Balance.