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/

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

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