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This is set on one of the tables in episode 9/10 and seems to burn inwards, pieces falling off as it goes - creating the spiraled chunks on the plate.

I've never seen anything like this before, is it something that exists outside of the show and what is its purpose?

Spiraling smoking object in question

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If you're looking to buy one or just have a look at more on the internet, they're commonly known as incense coils. –  erapago Mar 3 at 14:32
2  
I used to have many of that thing. I never though that it's consider as a weird thing outside my country. It produce smoke, but it doesn't smell nice. That's a mosquito-repelling incense, but it's not very effective. –  Shinobu Oshino Mar 3 at 23:56
    
No mosquitos where I live ^^; –  Toshinou Kyouko Mar 4 at 6:04
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You must be live in heaven –  Shinobu Oshino Mar 4 at 6:06

2 Answers 2

up vote 4 down vote accepted

This is a kind of burning incense. Its spiral form is a nice design decision, because it is both cool-looking and takes up much less space on the table than the more common stick form.

This form is also used for alletrine burning insecticides and repellents 1, 2.

Also, because the characters of this series often use various magical tricks to affect apparitions, this spiral incense might be designed to repel them.

Inari, Konkon, Koi Iroha also shows one of these spirals:

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But in Inari this is probably just the mosquito repellant thing. –  Mindwin Jul 21 at 20:36

This is what is commonly known as a "mosquito coil." These are mosquito-repelling incense, in spiral-shaped (this particular shape was popularized in Japan) and made up of a dried paste of pyrethrum powder.
I japan it's called "katori senkou" and it's usually green-ish swirly incense-like item, that you set on light and burn slowly. The smoke/smell that comes from it keeps the mosquito away.

As you may or may not know, just about all chemical repellents and insecticides contain pyrethroid, which is a chemical imitation of Pyrethrin, found in pyrethrum.

Katori Senko

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