chemistry

Sakabashira

Sakabashira is a chemistry 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 Sakabashira rather than just read about it. In short: Sakabashira (逆柱; さかばしら) or sakasabashira (逆さ柱; さかさばしら), meaning "reverse pillar", is a folk belief about wooden structures in Japan, and it refers to reversing the vertical direction of a tree from its original direction of growth when using it to make a pillar in a wooden building. Concept Since ancient times, a tree made into a reverse pillar is said to cause things like yanari to occur at night.

Key takeaways

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

Reference excerpt

Sakabashira (逆柱; さかばしら) or sakasabashira (逆さ柱; さかさばしら), meaning "reverse pillar", is a folk belief about wooden structures in Japan, and it refers to reversing the vertical direction of a tree from its original direction of growth when using it to make a pillar in a wooden building.

Concept Since ancient times, a tree made into a reverse pillar is said to cause things like yanari to occur at night. Besides making family fortunes decline, they were also said to cause unfortunate events such as fires, so they were greatly detested. The yōkai comic artist Mizuki Shigeru said that a reversed pillar would be a source of tree leaves yōkai, or that the pillar itself would turn into a yōkai. In Saikaku Oridome (西鶴織留), a piece of writing by Ihara Saikaku, a couple that lived in a house in front of the Kyoto Rokkaku-dō was tormented by this sakabashira paranormal phenomenon, and it is said that the sound of shattering beams would echo every night in that house, which led them to eventually move elsewhere. Also, in Odawara, it is said that a certain merchant was in the middle of a celebration when there was a voice that could be heard saying "my neck hurts", and upon looking for the source of the voice, it turned out that the voice came from the pillar in the zashiki (guest room), which is how the merchant knew that this pillar was a reverse pillar (sakabashira).

Reversed pillars that ward against calamity It is known that there is a reversed pillar at the gate Yōmeimon at Nikkō Tōshō-gū. This is because among the pillars, only one has its engraving patterns reversed, which is how it is known to be a reversed pillar. This is not reversed by mistake, but rather a trick in order to avoid the legend that "once the structure is complete, it will then start to collapse", so it is said that the building was intentionally left incomplete in order to avoid disaster, meaning that this reverse pillar was for warding against calamity. Furthermore, this is a completely different thing from the reversed pillars in yōkai legends. According to the Kamakura period Tsurezuregusa, something that is perfect is never good, so when building a dairi, one spot will be left not fully built. It is said that in the Edo Period, people said to "leave it three tiles unfinished".

Notes

Illustrations

Worked examples

Example 1 — a first encounter with Sakabashira

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

In research: Sakabashira appears in chemistry 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 Sakabashira 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: Sakabashira is common in secondary-school and first-year university syllabi. It links to neighbouring topics Architectural elements, Architecture in Japan, Cultural conventions, so understanding it makes those chapters shorter.
In everyday life: Look for Sakabashira 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 Sakabashira in 20 minutes

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

Frequently asked questions

What is Sakabashira in simple terms?

Why does Sakabashira matter?

Because it connects several chemistry 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 Sakabashira?

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 Sakabashira.