Kenneth Snelson sculpture, http://www.smithsonianmag.com/smithsonian-institution/how-does-hirshhorn-60-foot-needle-tower-stay-upright-in-stiff-wind-180953391/
Kenneth Snelson sculpture, http://www.smithsonianmag.com/smithsonian-institution/how-does-hirshhorn-60-foot-needle-tower-stay-upright-in-stiff-wind-180953391/