|Type||Aluminum & Stainless steel|
|Dimensions||1,800 cm × 618 cm × 540 cm (720 in × 243.5 in × 213 in)|
|Location||Hirshhorn Museum and Sculpture Garden, Washington, D.C., United States|
This very tall abstract sculpture is a tapering tower that is made of aluminum and stainless steel. The aluminum tubes push, held together by the stainless steel wire threaded through in the ends of the tubes. 
Snelson's unique sculpture style is well articulated in "Needle Tower".
Tensegrity describes a closed structural system composed of a set of three or more elongate compression struts within a network of tension tendons, the combined parts mutually supportive in such a way that the struts do not touch one another, but press outwardly against nodal points in the tension network to form a firm, triangulated, prestressed, tension and compression unit.
Much has been said about the geometric shapes seen in Snelson's works. Looking up from the inside of "Needle Tower" one may see the Star of David. According to Snelson, his works are not symbolic and it's common to see six-pointed stars in his work. In "Needle Tower" the six pointedness comes from the natural geometry of the three compression struts that make up each layer. Sets of three alternate with left and right helical module they add up to six when you look upwards into the tower.
In April 2010 conservation work was completed on the sculpture by the Hirshhorn Museum. It took 15 staff members to stand the tower up-right after conservation completion.
Needle Tower II
- Hirshhorn Museum and Sculpture Garden (2008). "Needle Tower, (sculpture).". Inventories of American Painting and Sculpture. Smithsonian. Retrieved 7 January 2010.
- A Garden for Art, Valerie J. Fletcher, LOC # 97-61991, p.85
- Kenneth Snelson. "FAQ". Kenneth Snelson. Retrieved 7 January 2010.
- Hirshhorn Museum and Sculpture Gardens (2010). "Installation of Kenneth Snelson's "Needle Tower"". YouTube. Retrieved 7 January 2010.
- Acquisitions of Modern Art by Museums: Supplement. The Burlington Magazine Publications, Ltd., Feb. 1971, p 119.
- Curious Skeletons by NASA
- "Needle Tower" on CMU 3rd Year Studio
- Hirshhorn's collection entry
- Installation video by the Hirshhorn of the sculpture being lifted upright
- Metal Sculpture by Kenneth Snelson on Mathematical paintings and sculptures
- "Needle Tower" assembly animation by Snelson
- "Needle Tower" on Kenneth Snelson's website
- "Needle Tower" on Grunch Net
- Waymarking Entry for "Needle Tower"
- "Tensegrities" Jan Marcus
- "Tensegrity" Scholarpedia article