science

Kumejima-tsumugi

Kumejima-tsumugi is a science 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 Kumejima-tsumugi rather than just read about it. In short: Kumejima-tsumugi (久米島紬; Okinawan: Kumijima chimuji) is the Ryukyuan craft of silk cloth practised in Kumejima, Okinawa Prefecture. Kumejima-tsumugi is the oldest type of tsumugi in Japan, out of the approximately two hundred forms of tsumugi, and is the oldest kasuri fabric.

Key takeaways

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

Reference excerpt

Kumejima-tsumugi (久米島紬; Okinawan: Kumijima chimuji) is the Ryukyuan craft of silk cloth practised in Kumejima, Okinawa Prefecture. Kumejima-tsumugi is the oldest type of tsumugi in Japan, out of the approximately two hundred forms of tsumugi, and is the oldest kasuri fabric. It is recognised as one of the Important Intangible Cultural Properties of Japan.

History Silk production has been practiced in Kumejima since the 15th century, after a local, having studied sericulture in Ming Dynasty China, transmitted the techniques. Mulberry plants, the primary foodstuff of silkworms, is said to grow particularly well on the island. By the 17th century, kumejima-tsumugi formed part of the tribute paid to the Ryūkyū Kings, and it was transported to Edo via the Satsuma Domain.

Production Silk floss is extracted from silkworm cocoons and spun by hand into yarn. It is then dyed with the kasuri technique, using indigenous plant dyes and a mud mordant to give it its characteristic black-brown colouring; the plants used are the guru, techika, kurubo or Japanese persimmon, yamamomo and yuna, or cotton tree hibiscus. Finally it is woven with a takahata (高機) loom, and fulled by block.

Intangible Cultural Property In 2004, the Kumejima Kasuri Technique Preservation Society (久米島紬保持団体) was founded, and kumejima-tsumugi was designated one of the Important Intangible Cultural Properties of Japan.

See also Important Intangible Cultural Properties of Japan National Treasures of Japan - Dyeing and weaving Representative List of the Intangible Cultural Heritage of Humanity Sericulture Kasuri Yūki-tsumugi, another form of tsumugi produced in Yūki List of Traditional Crafts of Japan

References

Worked examples

Example 1 — a first encounter with Kumejima-tsumugi

Start with the simplest possible case. Write down what Kumejima-tsumugi claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, 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 Kumejima-tsumugi 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 Kumejima-tsumugi 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 Kumejima-tsumugi

In research: Kumejima-tsumugi appears in science 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 Kumejima-tsumugi 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: Kumejima-tsumugi is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cultural Properties of Okinawa Prefecture, Culture of the Okinawa Islands, Important Intangible Cultural Properties (Japan), so understanding it makes those chapters shorter.
In everyday life: Look for Kumejima-tsumugi 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 Kumejima-tsumugi in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Kumejima-tsumugi 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 Kumejima-tsumugi out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Kumejima-tsumugi in simple terms?

Why does Kumejima-tsumugi matter?

Because it connects several science 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 Kumejima-tsumugi?

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 Kumejima-tsumugi.