astronomy

Needle Tower

Needle Tower is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Needle Tower rather than just read about it. In short: Needle Tower is a public artwork created by American sculptor Kenneth Snelson in 1968. It is located on the grounds of the Hirshhorn Museum and Sculpture Garden in Washington, D.C., USA.

Key takeaways

Needle Tower belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Needle Tower to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Needle Tower from memory before moving on to harder problems.

Reference excerpt

Needle Tower is a public artwork created by American sculptor Kenneth Snelson in 1968. It is located on the grounds of the Hirshhorn Museum and Sculpture Garden in Washington, D.C., USA.

Description This 26.5-meter-tall abstract sculpture is a tapering tower made of aluminum and stainless steel. The aluminum tubes act in compression, held in tension by the stainless steel cables threaded through the ends of the tubes. According to Valerie Fletcher from the Institute for Human Centered Design, the “Needle Tower brings together advanced engineering methods with a very sophisticated aesthetic of abstraction".

Acquisition The piece was a gift of Joseph Hirshhorn in 1974.

Tensegrity Snelson's unique sculpture style is well articulated in Needle Tower.

The structure style displayed is known as "tensegrity," a description given by Snelson's former professor Buckminster Fuller to the melding of tension and structural integrity. According to Snelson: 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.

Symbolism

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 modules, adding up to six when viewed upwards from the base of the tower.

Conservation Over time, small wires started to fray and snap. In April 2010 conservation work was completed on the sculpture by the Hirshhorn Museum. It took 15 staff members to stand the tower upright after conservation completion. The top portion was replaced, with Snelson handling the renovation.

Needle Tower II A second Needle Tower, Needle Tower II, was completed in 1968 and was acquired by the Kröller-Müller Museum in 1971. The piece resides in the museum's sculpture garden.

Gallery

See also List of public art in Washington, D.C., Ward 2

References

External links Curious Skeletons by NASA Archived 14 August 2020 at the Wayback Machine Hirshhorn's collection entry Needle Tower on Kenneth Snelson's website Waymarking Entry for Needle Tower

Illustrations

Worked examples

Example 1 — a first encounter with Needle Tower

Start with the simplest possible case. Write down what Needle Tower claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Needle Tower before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Needle Tower ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Needle Tower

In research: Needle Tower appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Needle Tower in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Needle Tower is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1968 sculptures, Abstract sculptures in Washington, D.C., Aluminum sculptures in Washington, D.C., so understanding it makes those chapters shorter.
In everyday life: Look for Needle Tower outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Needle Tower in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Needle Tower means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Needle Tower out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Needle Tower in simple terms?

Needle Tower is a public artwork created by American sculptor Kenneth Snelson in 1968. It is located on the grounds of the Hirshhorn Museum and Sculpture Garden in Washington, D.C., USA.

Why does Needle Tower matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Needle Tower?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Needle Tower.